The Gaia Theory Says That

The Gaia Theory says that

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