The resemblance of a stick insect to the twig on which it rests is best explained by
- A. natural selection favouring camouflaged variants over many generations
- B. the insect stretching its body towards twigs
- C. Lamarck's inner need for safety
- D. pure chance in every individual
Explanation
Birds removed the conspicuous insects generation after generation, leaving the better disguised to breed, until resemblance became remarkable. The insect does not change on purpose; selection filters what variation offers.
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