Long-lasting pesticides such as DDT
a. are target-specific.
b. are the most effective control over pests.
c. build up in concentration as they pass up a food
chain.
d. break down after the organism that receives the
pesticide dies.
e. do all of these.
Answer: c
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The specific discipline that linked Mendel's and Darwin's work was ____
a. population ecology b. paleobiology c. population genetics d. biogeography e. modern synthesis
Systemic involvement is rare in infection caused by Ancylostoma braziliense or Ancylostoma caninum; however, pneumonitis may occur. The antihelminthic therapy used to treat this infec-tion is:
a. ivermectin or thiabendazole. b. metronidazole or thiabendazole. c. mebendazole or ivermectin. d. albendazole or diethylcarbamazine.
Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have
A. swim bladders and gill covers called opercula. B. swim bladders and a closed circulatory system. C. swim bladders and a complete digestive system. D. swim bladders and movable jaws.
Which of the following is not a cause of increased levels of greenhouse gases?
A. All of the answer options are correct. B. burning of fossil fuels C. increasing cattle populations D. expansion of rice paddies E. thawing of the permafrost in the tundra