Which of the following pairs are the best examples of homologous structures? (a) bat wing and human hand(b) owl wing and hornet wing(c) porcupine quill and cactus spine(d) bat forelimb and bird wing(e) australian mole and north american mole

(a) bat wing and human hand.

Explanation:

Homologous structures are structures with the same embryonic origin  but are modified to perform different functions.

Both the bat wing and the human hand are pentadactyl (five digit) limb structure though they perform different functions.Their bat wing and human hand limb contain of three parts;the humerus ,the radius and ulna,a hand  made up of carpals ,metacarpals and phalanges.

This clearly indicates that they  share a common ancestry but due to  divergent evolution they are modified to perform different functions hence referred to homologous structures.

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