The energy source that powers most life on Earth is
A. solar.
B. glucose.
C. nuclear.
D. none of the above
Answer: A
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Which group of chemicals can cause birth defects?
A. teratogens B. mutagens C. carcinogens D. neurotoxins
Discuss the paleogeography of the Early Paleozoic. How did this paleogeography differ from
present-day geography? What will be an ideal response?
Discuss the possible development of birds from dinosaurs. What characteristics do they have in
common? What will be an ideal response?
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.