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Complete answer: It is observed that the level of DDT increases as the food chain progresses. It means, the primary consumers will have more DDT concentration than the producers, the secondary consumers will have more than primary consumers, and so on. The highest concentrations will be seen in the top carnivore.
The concentration of DDT increases, as it moves or travels along the food chains. Its concentration is maximum in top trophic level.
As animals lower on the food chain are eaten by other animals higher up, DDT becomes concentrated in the fatty tissues of predators (7,14). This continues until the primary predator of the food chain receives the highest dose, which may lead to adverse health effects.
What effects does DDT have on wildlife? DDT is slightly to moderately toxic to birds when eaten (15). DDE decreases the reproductive rate of birds by causing eggshell thinning and embryo deaths (14). DDT is highly toxic to aquatic animals (14).
Biomagnification happens when toxic chemicals, like DDT, whose remains in the environment are consumed indirectly by organisms through food. When an organism in the higher food chain consumes the lower organism containing such chemicals, the chemicals can get accumulated in the higher organism.

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Hence, the correct answer is Water-0.003ppm, zooplankton- 0.04ppm, small fish-0.5ppm, large fish-2ppm, fish eating birds-25ppm
DDT affects the food chain by bioaccumulating in organisms, as well as reducing population sizes that can feed higher trophic levels. A rough example of the food chain would have fish eating insects that have been poisoned with DDT.
The higher the trophic level of an organism, the higher the concentration of DDT. DDT is excreted from the body very slowly and it is stored in fat. Thus, when an organism consumes another organism, the DDT in the prey accumulates in the predator.

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