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Question 17

From Biology HL Paper 1 (May 2024, TZ2)

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  1. Modified hairs (quills) cover the bodies of hedgehogs (Erinaceus europaeus) and short-beaked echidnas (Tachyglossus aculeatus). However, these structures do not have the same evolutionary origin.
Two images side-by-side, one of a hedgehog and one of a short-beaked echidna, with lines pointing to 'quills' on both animals.
Two images side-by-side, one of a hedgehog and one of a short-beaked echidna, with lines pointing to 'quills' on both animals.

What is a possible explanation for the presence of quills in both species?

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