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BIO NMDCAT Lamarckism
nmdcat.online July 14, 2026

According to Lamarckism, the long legs of wading birds like herons developed because:

A. The birds had a desire to fly higher.
B. The birds kept stretching their legs to keep their bodies out of the water while searching for food.
✓
C. Water depth directly stimulated the bone growth factors in their legs.
D. Shorter-legged birds drowned and could not reproduce.

📝 Explanation

Herons stretched their legs constantly to stay dry while wading in water. Under Lamarck's "use" principle, this stretching elongated the limbs, a trait passed to subsequent generations.

📖 Additional Information

  • The birds had a desire to fly higher.
  • The birds kept stretching their legs to keep their bodies out of the water while searching for food.
  • Water depth directly stimulated the bone growth factors in their legs.
  • Shorter-legged birds drowned and could not reproduce.

Herons stretched their legs constantly to stay dry while wading in water. Under Lamarck's "use" principle, this stretching elongated the limbs, a trait passed to subsequent generations.

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