BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

32. Which observation most strongly suggests that the first living organisms were heterotrophic?

A. Organic molecules were already present in the primordial oceans.

✓

B. Oxygen was abundant in the atmosphere.

C. Chlorophyll evolved before cells.

D. Multicellular organisms existed before bacteria.

📝 Explanation

Correct: Early organisms likely consumed preformed organic molecules for energy. B: Oxygen was absent. C: Chlorophyll evolved later. D: Bacteria appeared long before multicellular life. Concept: First living organisms.

📖 Additional Information

Organic molecules were already present in the primordial oceans.
Oxygen was abundant in the atmosphere.
Chlorophyll evolved before cells.
Multicellular organisms existed before bacteria.

Correct: Early organisms likely consumed preformed organic molecules for energy. B: Oxygen was absent. C: Chlorophyll evolved later. D: Bacteria appeared long before multicellular life. Concept: First living organisms.

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