BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

22. Which observation best supports the idea that present-day Earth is less favorable for the spontaneous formation of life than primitive Earth?

A. Modern atmosphere contains abundant free oxygen.

✓

B. Oceans contain dissolved minerals.

C. Earth receives sunlight every day.

D. Volcanoes still erupt in some regions.

📝 Explanation

Correct: Oxygen oxidizes newly formed organic molecules, preventing their accumulation. B, C, D: These factors do not prevent organic synthesis to the same extent. Concept: Primitive versus modern Earth.

📖 Additional Information

Modern atmosphere contains abundant free oxygen.
Oceans contain dissolved minerals.
Earth receives sunlight every day.
Volcanoes still erupt in some regions.

Correct: Oxygen oxidizes newly formed organic molecules, preventing their accumulation. B, C, D: These factors do not prevent organic synthesis to the same extent. Concept: Primitive versus modern Earth.

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