BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

46. Which event most likely contributed to the shift from anaerobic to aerobic organisms during evolution?

A. Formation of protocells

B. Accumulation of atmospheric oxygen by photosynthetic organisms

✓

C. Appearance of multicellular animals

D. Formation of the primordial soup

📝 Explanation

Correct: Photosynthetic microorganisms gradually increased atmospheric oxygen, allowing aerobic respiration to evolve. A, C, D: These did not directly cause aerobic metabolism. Concept: Evolution of Earth's atmosphere.

📖 Additional Information

Formation of protocells
Accumulation of atmospheric oxygen by photosynthetic organisms
Appearance of multicellular animals
Formation of the primordial soup

Correct: Photosynthetic microorganisms gradually increased atmospheric oxygen, allowing aerobic respiration to evolve. A, C, D: These did not directly cause aerobic metabolism. Concept: Evolution of Earth's atmosphere.

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