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Which one of the following describes correctly the homologous structures?

1. Organs appearing only in embryonic stage and disappearing later in the adult
2. Organs with anatomical similarities, but performing different functions
3. Organs with anatomical dissimilarities, but performing same function
4. Organs that have no function now, but had an important function in ancestors

Correct answer: Organs with anatomical similarities, but performing different functions

Solution

Homologous structures have a common evolutionary origin and similar internal anatomy, but they may be adapted for different functions. For example, the forelimbs of humans, bats, and whales are structurally similar yet used for grasping, flying, and swimming.

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