The energy source that powers most life on Earth is

A. solar.
B. glucose.
C. nuclear.
D. none of the above


Answer: A

Environmental & Atmospheric Sciences

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Which group of chemicals can cause birth defects?

A. teratogens B. mutagens C. carcinogens D. neurotoxins

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A reverse biomass pyramid is typical of

A) terrestrial ecosystems because of the high concentration of sunlight. B) terrestrial ecosystems because land can support more animals than water. C) aquatic ecosystems because top consumers reproduce much more slowly and live much longer than producers. D) aquatic ecosystems because water contains much more oxygen than air.

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Discuss the paleogeography of the Early Paleozoic. How did this paleogeography differ from

present-day geography? What will be an ideal response?

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Discuss the possible development of birds from dinosaurs. What characteristics do they have in

common? What will be an ideal response?

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