A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide.
If the power fails and the lights go dark, what will happen to CO2 levels?
A) CO2 will rise as a result of both animal and plant respiration.
B) CO2 will rise as a result of animal respiration only.
C) CO2 will remain balanced because plants will continue to fix CO2 in the dark.
D) CO2 will fall because plants will increase CO2 fixation.
E) CO2 will fall because plants will cease to respire in the dark.
Answer: A
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