Imagine that a mad scientist was able to successfully travel 2 billion years back in time and modified the environment so that photosynthesis and respiration were completely coupled
(e.g., there was no "leakage" of products from respiration or photosynthesis). How would this
affect Earth's present-day atmosphere, if at all?
A. Earth's atmosphere would be unaffected.
B. Atmospheric O2 levels would increase.
C. Atmospheric O2 levels would decrease.
D. Atmospheric CO2 levels would increase,
but O2 levels would be unaffected.
E. Atmospheric O2 levels would increase, but
CO2 levels would be unaffected.
C
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Fill in the blank(s) with the appropriate word(s).