BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

17. Which feature of the first living organisms is most consistent with the conditions of primitive Earth?

A. Aerobic and multicellular

B. Aerobic and photosynthetic

C. Anaerobic and simple

✓

D. Eukaryotic and highly specialized

📝 Explanation

Correct: Free oxygen was absent; therefore, the earliest organisms were simple anaerobic cells. A, B: Require oxygen. D: Complex eukaryotes evolved much later. Concept: Earliest life forms.

📖 Additional Information

Aerobic and multicellular
Aerobic and photosynthetic
Anaerobic and simple
Eukaryotic and highly specialized

Correct: Free oxygen was absent; therefore, the earliest organisms were simple anaerobic cells. A, B: Require oxygen. D: Complex eukaryotes evolved much later. Concept: Earliest life forms.

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