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BIO NMDCAT Concept of Evolution
nmdcat.online July 14, 2026

12. Which condition would have been least favorable for the accumulation of organic molecules on primitive Earth?

A. Frequent lightning
B. A reducing atmosphere
C. Abundant free oxygen
✓
D. High volcanic activity

📝 Explanation

Correct: Oxygen readily oxidizes organic compounds, preventing their accumulation. A, B, D: These conditions favored chemical evolution. Concept: Primitive Earth conditions.

📖 Additional Information

  • Frequent lightning
  • A reducing atmosphere
  • Abundant free oxygen
  • High volcanic activity

Correct: Oxygen readily oxidizes organic compounds, preventing their accumulation. A, B, D: These conditions favored chemical evolution. Concept: Primitive Earth conditions.

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