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nmdcat.online July 14, 2026

Which of the following provides the most direct evidence of natural selection occurring in real-time within natural populations?

A. The similarity of embryonic development stages across different vertebrate classes.
B. The fossilized remains of transitional species like Archaeopteryx.
C. The evolution of antibiotic resistance in bacteria and pesticide resistance in insects.
✓
D. The universal nature of the genetic code across all domains of life.

📝 Explanation

The rapid development of resistance in bacteria and pests is a documented, direct observation of natural selection occurring in contemporary times under strong selective pressures.

📖 Additional Information

  • The similarity of embryonic development stages across different vertebrate classes.
  • The fossilized remains of transitional species like Archaeopteryx.
  • The evolution of antibiotic resistance in bacteria and pesticide resistance in insects.
  • The universal nature of the genetic code across all domains of life.

The rapid development of resistance in bacteria and pests is a documented, direct observation of natural selection occurring in contemporary times under strong selective pressures.

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