Today,the pathways of photosynthesis and cellular respiration are complementary and relatively balanced,but early in the history of life on Earth,photosynthesis appears to have dominated.One piece of evidence that suggests the early dominance of photosynthesis is the A) accumulation of atmospheric oxygen. B) declines in historic sea levels as photosynthetic organisms consumed water. C) gradual warming of Earth's climate as CO₂ slowly accumulated. D) sequestration of O₂ in Earth's oceans.

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The accumulation of atmospheric oxygen is a clear indicator of the dominance of photosynthesis, as photosynthetic organisms produce oxygen as a byproduct. This oxygen gradually accumulated in the Earth's atmosphere, which paved the way for the evolution of aerobic organisms that rely on oxygen for respiration.

Today,the Pathways of Photosynthesis and Cellular Respiration Are Complementary and Relatively