What name is given to the forelimbs like those of X and Y, which have the same basic design, but different functions?

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Solution

The forelimbs of X and Y are called 'homologous organs'

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Q. X, Y, and Z are three animals. The animal X can fly but animal Y can only run on ground or walls. The forelimbs of animals X and Y have the same basic design but they are used for different purposes such as flying and running respectively. The animal Z became extinct a long time ago. The study of fossils of Z tells us that it had some features like those of X and some like those of Y. In fact, Z is said to form a connecting link in the evolutionary chain of X and Y.
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