Photosynthesis and Cellular Respiration Are Both Complementary and Relatively Balanced

Photosynthesis and cellular respiration are both complementary and relatively balanced, but early in the history of life on Earth photosynthesis appears to have dominated, as evidenced by the

A) accumulation of atmospheric oxygen.
B) declines in historic sea level as photosynthetic organisms consumed water.
C) gradual warming of Earth's climate as CO₂ slowly accumulated.
D) all of the above