The Gaia Theory says that
A. the complementary actions of respiration and photosynthesis have maintained a relatively stable atmospheric pool of carbon dioxide and oxygen.
B. all living things must obtain nutrients and energy from their environment.
C. all elements have their origin in a nonliving, long-term reservoir.
D. the biosphere contains a diversity of habitats and niches favorable to life because living things have made it that way.
E. ecosystems are open with regard to energy because the sun is constantly renewing them with a renewable source.
Answer: D
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A. true B. false
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