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

question 33

Multiple Choice

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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