Biology

Biology, 27.07.2019 21:30, jojojojo5730

Polychlorinated biphenyls (pcbs) that cause cancer and birth defects are classified as a. carcinogens b. contamination c. pollution d. toxigens

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1. sketch a hypothetical food chain, with the owl at the top and its prey species below. complete this food web by hypothesizing about other possible sources of food available to the prey species. 2. discuss the difference in the stability of highly webbed food chains and linear food chains. give examples of each. do you suppose the owl food chain is webbed or linear? 3. the top predator in a food chain, whether it is an owl, a human, or a bald eagle, often has a higher concentration of biologically magnifiable pesticides or carcinogens in their bodies, such as ddt or polychlorinated biphenyls (pcbs), than the ambient concentrations existing in the air or water. a. if you were to analyze (perform a necropsy on) an owl’s flesh, where would you expect to find the highest concentrations of such non-polar organic compounds (such as ddt and pcbs? ) 4. why are food chains short? explain why there is no super predator that specializes in eating barn owls (who may eat other, smaller owls).

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