BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

34. Which characteristic of the primitive atmosphere made it suitable for chemical evolution?

A. High concentration of ozone

B. Presence of reducing gases such as methane and ammonia

✓

C. High concentration of oxygen

D. Presence of abundant chlorofluorocarbons

📝 Explanation

Correct: Reducing gases favored the synthesis of organic compounds. A: Ozone developed later. C: Oxygen inhibits organic synthesis. D: Chlorofluorocarbons are modern pollutants. Concept: Primitive atmosphere.

📖 Additional Information

High concentration of ozone
Presence of reducing gases such as methane and ammonia
High concentration of oxygen
Presence of abundant chlorofluorocarbons

Correct: Reducing gases favored the synthesis of organic compounds. A: Ozone developed later. C: Oxygen inhibits organic synthesis. D: Chlorofluorocarbons are modern pollutants. Concept: Primitive atmosphere.

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