Homologous organs are .......

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(D) Homologous organs are those that have a common embryonic origin and similar basic structural plan,but may perform different functions.$D$. Pectora

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Pectoral fins of fishes and hind limbs of horses

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(D) Homologous organs are those that have a common embryonic origin and similar basic structural plan,but may perform different functions.$D$. Pectoral fins of fishes and hind limbs of horses (or forelimbs of mammals) are considered homologous because they share a similar skeletal structure (humerus,radius,ulna,carpals,etc.) despite performing different functions like swimming and walking.Options $A$,$B$,and $C$ represent analogous organs,which have similar functions but different evolutionary origins.

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