BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

28. According to modern evolutionary concepts, the transition from chemical evolution to biological evolution occurred when:

A. Organic molecules became organized into self-replicating living systems.

✓

B. Dinosaurs first appeared on Earth.

C. Oxygen accumulated in the atmosphere.

D. Multicellular organisms evolved.

📝 Explanation

Correct: Biological evolution began once the first living, self-replicating cells appeared. B, C, D: These events occurred much later. Concept: Chemical versus biological evolution.

📖 Additional Information

Organic molecules became organized into self-replicating living systems.
Dinosaurs first appeared on Earth.
Oxygen accumulated in the atmosphere.
Multicellular organisms evolved.

Correct: Biological evolution began once the first living, self-replicating cells appeared. B, C, D: These events occurred much later. Concept: Chemical versus biological evolution.

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