What was the major point learned in the 1991 Biosphere 2 experiment?

A. We should focus on recycling waste and wastewater.
B. We should learn how to grow a rainforest in an enclosed area for life support.
C. We must be aware that CO2 recycling is really difficult.
D. We cannot engineer life-supporting systems as well as those provided by nature.
E. We must admit that extinction is inevitable.


Answer: D

Environmental & Atmospheric Sciences

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