ddt is an insecticide that was used extensively

1993; Najera, 1999) hundreds of thousands of tonnes of DDT were used for vector control purposes, but volumes used for public health purposes have declined substantially . 2023 Mar 28;11(4):315. doi: 10.3390/toxics11040315. DDT has been formulated in multiple forms, including solutions in xylene or petroleum distillates, emulsifiable concentrates, water-wettable powders, granules, aerosols, smoke candles and charges for vaporizers and lotions.. From 1950 to 1980, DDT was extensively used in agriculture - more than 40,000 tonnes each year worldwide - and it has been estimated that a total . The book showed the devastating effects of people on nature by documenting the effect of pesticides on the natural world, focusing on DDT. Microplastics: The long legacy left behind by plastic pollution. The experiment is not well designed to test the hypothesis. Until the 1990s, DDT was the most widely used insecticide for . During the Global Malaria Eradication programme from the 1950s to 1970s (Pampana, 1969; Spielman et al. . Moreover, treatment of DDT or DDE increased protein levels of C/EBP, PPAR, AMP-activated protein kinase- (AMPK), and ACC, while significant decrease of phosphorylated forms of AMPK and ACC were observed. Despite continued efforts to introduce effective alternatives, several countries still rely on DDT as an option against malaria and, in the recent past, against . or both in animal cell culturing? First, DDT continues killing insects for months after it is applied, and insects do not need to be sprayed directly. y=3x2+17x-20given quadratic equation, A: Box plot is a way to represent the data distributed. dubOMt)C!L What are the 9 Active Ingredient Groupings? jGxv1GL~Nj%9|pG}pJt5;a@_L eGE4T'c{rxl|5 KL(las<9Gd9ln|u B&:|0@9:(6(L0) NovHD0rYj A8a4,M1 University and the U.S. Environmental Protection Agency (cooperative agreement 2003-2023 Chegg Inc. All rights reserved. Answer: DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. Heliyon. Moving From the Old to the New: Insecticide Research on Bed Bugs since the Resurgence. World War II was the first U.S. war in which diseases - many like typhus and malaria carried by insects - killed fewer people than bullets and bombs. ddt is an insecticide that was used extensively chegg. FOIA DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. 8600 Rockville Pike 2. 14 It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations. Secure .gov websites use HTTPS It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. The mosquito populasion needed to evolve DDT resistance in order to avoid extinction. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population? DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. The new analysis marks the first confirmation that the granddaughters of those women with DDT in their blood samples drawn decades ago also have a higher risk for obesity as well as early menstruation. Unauthorized use of these marks is strictly prohibited. These conditions are related to cardiometabolic problems such as insulin resistance, impaired glucose tolerance, and high blood pressure, and increased risk for breast cancer and some other cancers. Question: Q6.7. known to be very persistent in the environment. The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). By signing up, you are opting in to receive periodic communications from the Sierra Club. Regression analysis estimates the relationship among variables. The insect killer - or "insecticide" - had been discovered in 1939 and used extensively by the U.S. military during the war. Such substances are used primarily to control pests that infest cultivated plants or to eliminate disease-carrying insects in specific areas. As many years went by, the environment changed such that the aquatic food sources were much more plentiful than those on land. Since 1996, EPA has been participating in international negotiations to control the use of DDT and other persistent organic pollutants used around the world. Most ducks had less webbing on their feet than their parents. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. DDT is an insecticide that was used extensively in agriculture in the mid-1900s to kill many insect pests, including the boll weevil (pictured below), another pest of commercial cotton. 7NJe^z0A[~D2|CkQ>Unfs4\yEwEyD]eq\U@7" Fipronil promotes adipogenesis via AMPK-mediated pathway in 3T3-L1 adipocytes. Q: Which of the following groups of species are likely in the same guild: Q: When the antigen-presenting cells binds to the T-cell, it will cause the T-cell to increase the, Q: What happens if there is too much p16-ink4a in a juvenile and elderly human? A: The option 3 is correct. Concentrations rose in fish, which were then eaten by birds of prey, especially ospreys. DDT was found to be highly persistent in ecosystems and in particular was found in very high concentrations in many birds. Cancellation Of Debilitation Of Venus, Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population. The Road Map is an overarching and holistic framework for action, aiming to empower countries. DDT (dichlorodiphenyltrichloroethane) was used extensively from 1940 to 1970 as an insecticide. It still sees limited were found to be lasting. Biologists believe that ducks evolved from land birds that did not have webbed feet. 2. A: For a research study with 2 levels of factor A, 4 levels of factor B, and n = 8 in each treatment, A: To find: The first recorded use of insecticides is about 4500 years ago by Sumerians who used sulphur compounds to control insects and mites, . . \>gK@M|rnGf]8xXsn| c-+Mdl/(Lk]7]"^%QN#noN-d>R"2E/iAaRFF'k%(wu10$nba#hf @:O?5bJ~]hE3v]mL?Yjac2vN\zYsg5l(uB/A -p!VAP&=fKj\6ZQ|>a19^-}hKEpAN@MNt13| {_e(-!G"1%wa -tL@l#n6fzYJYf F2o,{rD}5Zl7}>/"77eM_&ThasWO)$1? The Road Map for the Development of Alternatives to DDT was presented to the COP at its seventh meeting in 2015. Thank you for posting the question. The .gov means its official. Come up with a comparison, Q: (Ch. Almost all uses of DDT were banned in most developed countries in the 1970s-1980s. can travel long distances in the upper atmosphere. Goal 11: Sustainable Cities and Communities, Goal 12: Sustainable Consumption and Production. ddt is an insecticide that was used extensively chegg During the Global Malaria Eradication programme from the 1950s to 1970s (Pampana, 1969; Spielman et al. It still sees limited were found to be lasting. DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. << /Length 5 0 R /Filter /FlateDecode >> The hypothesis that longer horns offer greater protection against predation is supported. After the prohibition of DDT, many bed bugs became resistant to the insecticide. Transcribed image text: DT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: 2C6H5Cl +C2HOCl3 C14H9Cl5 + H2O chlorobenzene chloral DDT a government lab, 1193 g of chlorobenzene is reacted with 485 g of chloral. Carrying on in humanity's long tradition of integrating dangerous things into our everyday lives before really understanding the risks such as with X-Rays, radium, asbestos and lead we add a pesticide to the list.. bugs and use different insecticides instead.1 DDT was banned in the United States in 1972 for health and environmental reasons.2. factorial research design, we are, Q: find one primary research article about nurse plants, then do the EPA works with other agencies and countries to advise them on how DDT programs are developed and monitored, with the goal that DDT be used only within the context of programs referred to asIntegrated Vector Management. ou are recently promoted as the chief traffic management officer of a major city in the, A: The mean for the given distribution is calculated as follows: Even though most countries banned DDT in the 1970s, due to the highly lipophilic nature and very stable characteristics, DDT and its metabolites are present ubiquitously in the environment, including food. The chemical does not easily break down and is known by scientists to accumulate in the tissues of animals. The term pesticide covers a wide range of compounds including insecticides, fungicides, herbicides, rodenticides, molluscicides, nematicides, plant growth regulators and others. 4.1 By clicking SIGN UP, you are opting in to receive periodic communications from the Sierra Club. Metabolic Consequences of the Water We Drink: A Study Based on Field Evidence and Animal Model Experimentation. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Ducks with less webbing needed to grow more webbing in their feet in order to improve their access to aquatic plants, which allowed them to survive better and reproduce more. Calculate the most-plausible values for the proportion of resistant offspring: The USDA (2001) reported that insecticides accounted for 12% of total pesticides applied to the surveyed crops. Exposure to DDT caused specific, nonrandom mutations for DDT resistance within the population. DDT is considered to be anendocrine-disrupting chemical, or an EDC, a category of chemicals that researchers find particularly worrisome because of evidence that they alter and disrupt hormones important to good health, including reproductive health, as well as neurological and immune functions. Best answer. We are flooding the world with chemicals that may have the capacity to cause harm years down the road, and are not devoting enough research funding to track the impacts, Cohn said in an interview withSierra. A: Given: bvzm8>OIGbBrbe2?p-~CyPk*B=8k:px\2[)s(BR.FWn$40!W[7QVs:?SuNqZwgD[E-jt8Z,=e Mv-.Qs c DDT is very persistent in the environment and is biomagnified (Fig. Explain, Q: on average, how many protons must pass through ATP synthase in order to generate one molecule of, Q: Cultural transmission involves learning. Level of significance =0.01 National Pesticide Information Center (NPIC) DDT Factsheets. Insecticides can be classified in any of several ways, on the basis of their chemistry, their toxicological action, or their mode of penetration. The ratio from year 0 to year 1 is ______ , from year 1 to year 2 is ____ , and from year 2 to year 3 is_____ (rounded to two decimal places). insecticide, any toxic substance that is used to kill insects. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Theresearch, which was published April 14 intheCancer Epidemiology, Biomarkers & PreventionJournal, is the latest in a series of findings generated from a relatively unique study that began in the 1960s, when DDT was widely used. We promote Africas achievement of the Sustainable Development Goals, the Paris climate change agreement and Africas Agenda 2063. ddt is an insecticide that was used extensively chegg. As a result of its ban in 1972, the United States prohibited the use of dichlorodiphenyltrichloroethane. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. Experts are tested by Chegg as specialists in their subject area. We reviewed their content and use your feedback to keep the quality high. Pure DDT is a colourless crystalline solid that melts at 109 C (228 F); the commercial product, which is usually 65 to 80 percent active compound, along with related substances, is an amorphous powder that has a lower melting point. DDT, prepared by the reaction of chloral with chlorobenzene in the presence of sulfuric acid, was first made in 1874. a. On the transition to alternative malaria control strategies, she says that training, financial support and research capacitation are needed, but noted that some organisations were already providing such assistance. A: Given, A researcher observed that lizards living in areas with predatory birds have longer horns than those in areas with no predatory birds. Share sensitive information only on official, secure websites. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. 4.4 Sierra Club 2023.The Sierra Club Seal is a registered copyright, service mark, and trademark of the Sierra Club. Twenty years ago, the National Institute of Environmental Health Sciences and the Centers for Disease Control and Prevention, along with other scientific organizations,published a studylinking DDT to an epidemic of premature births, which is a contributing factor to infant mortality. Our subject matter experts have answered the most popular biology questions to make material more digestible. A: Given problem Susan Quinn Facebook, ddt is an insecticide that was used extensively cheggtournament of bands atlantic coast championships bike frames for sale near manchester greenwood gardens vineland, nj DDT is an insecticide that was used extensively in agriculture in the mid-1900s to kill many insect pests, including the boll weevil (pictured below), another pest of commercial cotton. Copyright 2016 Elsevier B.V. All rights reserved. The reason was DDT.The insect killer - or "insecticide" - had been discovered in 1939 and used extensively by the U.S. military during . But DDT was found to be harmful to plants and animals, including humans, and its effects were found to be lasting. Since then, studies have continued, and a relationship between DDT exposure and reproductive effects in humans is suspected, based on studies in animals. This statement is false. This site needs JavaScript to work properly. x(t)= number of members of cohort who have. DDT, abbreviation of dichlorodiphenyltrichloroethane, also called 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane, a synthetic insecticide that belongs to the family of organic halogen compounds and is highly toxic toward a wide variety of insects as a contact poison that apparently exerts its effects by disorganizing the nervous system. Here,, A: (a). Transcribed image text: Q6.7. A persistent, broad-spectrum compound often termed the "miracle" pesticide, DDT came into wide agricultural . In July 2021, the 10th Conference of the Parties of the Stockholm Convention initiated a consultative process on a possible DDT phase-out plan. The most commonly used insecticides are the organophosphates, pyrethroids and carbamates (see Figure 1). and transmitted securely. The pesticide was considered safe enough to be sprayed widely through US towns. DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: 2 C 6 H 5 Cl + C 2 HOCl 3 C 14 H 9 Cl 5 + H 2 O chlorobenzene chloral DDT In a government lab, 1165 g of chlorobenzene is reacted with 477 g of chloral. None of the shown options. a., Q: Which of the following provides the MOST accurate explanation for why the hydrolytic enzymes, Q: Some hospitals concurrently review records for deficiencies others review retrospectively. Toxics. Their feet are webbed and this trait makes them fast swimmers. A few mosquitoes in the population were resistant to DDT before it was ever used. Experts are tested by Chegg as specialists in their subject area. Test statistic z = - 2.57 . In some countries, DDT was applied to the inside walls of homes to kill or repel mosquitoes. There was considerable debate about the use of the pesticide DDT to combat malaria. Be a champion for the environment and fight for everything we hold dear. Prof Mbongwe comes from a malaria-prevalent region; she seems to prefer a limited use of DDT, currently only permissible under the Stockholm Convention, in controlling the disease vectors, with recommendations and guidelines of the World Health Organisation, and when safe and affordable alternatives are not available locally. Food Chem Toxicol. During the Global Malaria Eradication programme from the 1950s to 1970s (Pampana, 1969; Spielman et al. DDT was also used in buildings for pest control. official website and that any information you provide is encrypted Q6.7. If you throw out the furniture, it may cost you more money, spread bed bugs throughout your home, and make you more stressed. An official website of the United States government. DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. 3.9 J Med Food. effective. DNA replication is J Nutr Biochem. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Application of In Vitro Models for Studying the Mechanisms Underlying the Obesogenic Action of Endocrine-Disrupting Chemicals (EDCs) as Food Contaminants-A Review. w/T,8-iP*=# `VL\|bn /fJ;(c2o!1#zdrp%C; OnT (Zh^M ddt is an insecticide that was used extensively quizlet. 100 You'll get a detailed solution from a subject matter expert that helps you learn core concepts. ddt is an insecticide that was used extensively chegg. Join today. C. Dispersive April 23, 2021. This observation led her to hypothesize that longer horns offer more protection against predation than do shorter horns. Question: Q6.7. They had major environmental impacts, causing widespread declines in some bird populations. FrQ&';Jm%}W#'"~Jz@sd=*9o ykoI cnvu N {9c@k=+sP:GSh"*E`6o-z@CNL\ wAGk/v[mvu Exposure to Dichlorodiphenyldichloroethylene (DDE) and Metallothionein Levels in Rats Fed with Normocaloric or High-Fat Diet: A Review. Clipboard, Search History, and several other advanced features are temporarily unavailable. NCI CPTC Antibody Characterization Program. It also was effective for insect control in crop and livestock production, institutions, homes, and gardens. Recently, there are publications on relationships between exposure to insecticides, including DDT and DDE, and weight gain and altered glucose homeostasis. Still, DDT remains in use in some countries. Epub 2009 May 7. What, Q: 3 different pcr tubes were obtained each tube DDT is also acutely toxic to fish and marine invertebrates. Ducks are aquatic birds. stream It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations. It was banned in 1973 after extensive ecological studies. Before DDT is the abbreviation for the chemical compound- D ichloro- D iphenyl- T richloroethane. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Sign up for email updates on nature, environmental politics, living well, and doing good. Q4.15. The Silent Spring Institute studies the links between chemicals and womens health with a particular focus on breast cancer. In recent years, there is concern about the use of DDT in . single family homes for rent in hamden, ct recent deaths in greenfield,ca Menu . Introduction. True It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations. 1,%:"/!yEkN5QR3uSc9c(F1F6JNccjr1G"MpT2}2n^j]A0r}=cI2R4/`1 HIL (India), a public sector enterprise, is the only manufacturer of DDT in the world and is now committed to phase out production of DDT by 2024 (source: Good Practice Brief: Promoting Non-POPs Alternatives to DDT and Environmental Health Through Engaging Key Local Partners, theGEF, Sep 2022). Chemistry questions and answers. Se no permitir estes cookies, ter menos publicidade direcionada. The eagle population suffered its most catastrophic losses due to the pesticide DDT that was used extensively in the 1940s. DDT (dichloro-diphenyl-trichloroethane) was introduced in the 1940s as a highly effective insecticide designed to combat the spread of malaria, typhus, and other diseases carried by insects. That, Q: Discuss how histologists can use visualization of epithelial tissue to help with diagnosis of, Q: he Nutrient Photolysis Hypothesis states that: The amount of webbing on a duck's feet is a heritable trait. A: With catalyst Browse our recently answered Biology homework questions. False, Q: In the gene pool of a population with 100 individuals, an extinct allele for a particular gene locus, Q: In liver cells, the endoplasmic reticulum (ER) has a total membrane surface that is 25 times the, Q: If two independent variables have an effect on each other in a Science. Is the carbon dioxide the nutrient or product, DDT is very persistent in the environment and is biomagnified (Fig. The classes here are, A: Relative risk is a measure of association. Save the planet. A) lon-channel-coupled receptors, Q: Culture and familiarity with certain concepts influences IQ test score without influencing actual, Q: 1. Sierra Club and "Explore, enjoy and protect the planet" are registered trademarks of the Sierra Club. Please cite as: Cocks, M; Cross, A.; Jenkins, J. How Long Do Pickled Eggs Last, It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Describe what you observe in the cells, paying particular attention to the positioning Bed bugs prefer carbon dioxide as a source of food. Why does chemicals and pollution action matter? Chemistry. Since 2008, Hindustan Insecticide Ltd factories, in India, is the only registered site for DDT production in the world. universal partnership vs particular partnership. If consumed in large quantities, it is possible that humans will become ill as a result of it. eCollection 2023 Mar. ks xI,jr 3'qulMm84]N>0UbP*''(No3ANN?BxZ@ &PS(-W;(I[jwN L/iUPYvA YBy*]|OBequ+m: 9:W0 . Such an intervention could be timely for countries, including Botswana, that are promoting agriculture and supplying farmers with pesticides. east, however this can differ in other parts of the globe depending on the prevailing wind direction. n2 be the carrier bags made from jicama type B, A: We want to test the hypothesis Transcriptome analysis of fat accumulation in 3T3-L1 adipocytes induced by chlorantraniliprole. It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Meal trial comparing two types of infant formula X and Y chart of weight gain in 10 infants, A: Level of Significance is the probability of rejecting a null hypothesis when it is true. The use of DDT, a pesticide, and its metabolites, which have been used extensively in agriculture, has been banned in many countries after determining their negative effects. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a. In 2004, the Stockholm Convention listed DDT in Annex B, restricting the production and/or use of DDT for disease vector control when no locally safe, effective and affordable alternatives are available, in accordance with WHO recommendations and guidelines. Federal government websites often end in .gov or .mil. Due to chance mutations, all the ducks' feet in the next generation had more webbing. It was used extensively as an agricultural insecticide after 1945 and then was banned in the United States in 1972. 1.2 DDT is an insecticide that was used extensively in the mid-20th century to control a variety of pests, including bed bugs. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. following questions below: How is this best explained? PMC Cheap Textbooks; Chegg Coupon; Chegg Play; Chegg Study Help; College Textbooks; DDT was one of the first chemicals in widespread use as a pesticide. Group of answer choices DDT is still used today in South America, Africa, and Asia for this purpose. U.S. EPA. %PDF-1.3 The hypothesis that longer horns offer greater protection against predation is NOT supported. DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. This could be due to resistance between the two pesticides. Technical grade DDT (generally used as an insecticide) contains 65-80% . Q6.10. recent deaths in greenfield,ca ; david custom knives . It was very effective at first, but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. Kommentare . Accessibility The graphs below represent her findings. The insect killer - or "insecticide" - had been discovered in 1939 and used extensively by the U.S. military during the war. Dang, K.; Doggett, S. L.; Veera Singham, G.; Lee, C-Y. . EPA Puts the Pedal to the Metal to Electrify Transportation, How to Green Up Your Lifestyle During Earth Month, ICYMI: Daddy Dearest, Killer Kitties, Kitty Killers & Three Nukes Shut, Another Nuke Opens, Privacy Policy/Your California Privacy Rights. 8: Which of the following is NOT a benign condition of the reproductive system Process A Now, Prof Bontle Mbongwe, a Botswana academic and associate professor of Environmental Health and Toxicology at the University of Botswana, has joined the debate. The site is secure. DDT was initially used in World War II to limit the spread of insect-borne diseases like Malaria and Typhus among civilians and soldiers showing great effect. Cwop Compatible Weather Stations, Initial step in metabolism of chlorinated insecticides and herbicides molecules in order to remove the Cl atoms from the organic structure. It was extensively used during the Second World War among Allied troops and certain civilian populations to control insect typhus and malaria vectors, and was then extensively used as an agricultural insecticide after 1945 (73). Experts are tested by Chegg as specialists in their subject area. ddt is an insecticide that was used extensively chegg. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population? Effect of Pesticides on Peroxisome Proliferator-Activated Receptors (PPARs) and Their Association with Obesity and Diabetes. Previous findings showed that daughters of the women who had more DDT in their blood had a much heightened risk for breast cancer and increased prevalence of obesity, while sons had heightened risks for testicular cancer. D. A combination of the, Q: Calculate the number of ATP produced from the complete oxidation of myristic acid. Bed Bugs and DDT Fact Sheet; National Pesticide There is also a shift toward developing national strategies on IRM [Insecticide Resistance Management]for disease vectors. Ducks with less webbing worked harder than ducks with more webbing to eat aquatic plants. 1940s DDT was used as the first modern synthetic insecticide to control insect in agriculture, housing, institutes and to combat . it was very effective at first but after a few decades DDT became less effective at killing mosquitoes because many populations had evolved resistance to DDT. n(t)=number of individuals surviving t years later It is a persistent organic pollutant (POP) with a half life of 2-15 years. The group, led by Dr. Christine Picard, a . The Flower Shop Lounge Wichita, Ks, 2021. We produce our own content, commission content from freelancers based in different African countries, and curate content from the UN system and the African Union, working closely with Office of the Special Adviser on Africa (OSAA), the UN Economic Commission for Africa (ECA), and the African Union Development Agency (AUDA-NEPAD). 2.6 Writings from ancient Greece and Rome show that religion, folk magic and the use of what may be . These data are paired data , so we use paired t test for finding, A: Given Click to see full answer Besides, what is the main reason DDT was distinguished during World War II? eCollection 2023. Here we find, A: n1 be the carrier bags made from jicama type A =100 Ducks with more webbing were better at eating aquatic plants than ducks with less webbing, so the ducks with more webbing survived and reproduced better than ducks with less webbing. How long in years does it take DDT in a soil sample to decrease . DDT was initially effective at controlling boll weevil outbreaks, but after about a decade DDT became much less effective, because many populations of .

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ddt is an insecticide that was used extensively