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Which of the following are homologous organs?

1. Wings of birds and locust
2. Wings of birds (sparrow) and pectoral fins of fish
3. Wings of bat and butterfly
4. Legs of frog and cockroach

Correct answer: Wings of birds (sparrow) and pectoral fins of fish

Solution

Homologous organs share a common evolutionary origin even if they perform different functions. Bird wings and fish pectoral fins both arise from the same basic vertebrate forelimb plan, so they are homologous.

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