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nmdcat.online July 14, 2026

Regarding the evolutionary transition of birds, how would Lamarck explain the development of webbed feet in ducks?

A. Ducks with random mutations for webbed feet survived better than non-webbed ones.
B. Ducks kept spreading their toes to swim, stretching the skin between them, and passed this acquired webbed skin to offspring.
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C. Webbed feet were a vestigial trait inherited from terrestrial reptilian ancestors.
D. The aquatic environment directly dissolved the skin between the toes over generations.

📝 Explanation

Lamarck explained webbed feet as an acquired physical modification resulting from the continuous effort of spreading the toes to push water while swimming.

📖 Additional Information

  • Ducks with random mutations for webbed feet survived better than non-webbed ones.
  • Ducks kept spreading their toes to swim, stretching the skin between them, and passed this acquired webbed skin to offspring.
  • Webbed feet were a vestigial trait inherited from terrestrial reptilian ancestors.
  • The aquatic environment directly dissolved the skin between the toes over generations.

Lamarck explained webbed feet as an acquired physical modification resulting from the continuous effort of spreading the toes to push water while swimming.

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