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nmdcat.online July 14, 2026

Under Lamarck’s theory, how would the webbed feet of frogs be explained?

A. Frogs with mutations for webbed toes survived a severe flood.
B. Frogs stretched their skin between their toes while pushing against water, and this stretched skin was inherited.
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C. The aquatic environment chemically melted the toe joints together.
D. Webbed feet are a non-adaptive byproduct of pelvic bone growth.

📝 Explanation

Lamarckism explains webbed digits as physical structures acquired through repeated stretching of the skin during swimming (use), which is then inherited.

📖 Additional Information

  • Frogs with mutations for webbed toes survived a severe flood.
  • Frogs stretched their skin between their toes while pushing against water, and this stretched skin was inherited.
  • The aquatic environment chemically melted the toe joints together.
  • Webbed feet are a non-adaptive byproduct of pelvic bone growth.

Lamarckism explains webbed digits as physical structures acquired through repeated stretching of the skin during swimming (use), which is then inherited.

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