Question

Why penguins have short wings according to Lamarck

Answer 1

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By the same token, Lamarck believed that disuse would cause a trait to become reduced. The wings of penguins, for example, would be smaller than those of other birds because penguins do not use them to fly.

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Answer 2

Question:

Why penguins have short wings according to Lamarck?

Answer:

Lamarck believed that disuse can make a body part become smaller or reduced. That is, if one does not use a body part for a long time, the later adaptations of that animal is likely to have a reduced form of that body part.

This is the same case with the penguin.

A penguin does not fly, therefore the wings of the penguins  would be smaller than those of other birds.