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Types of Joints

A line in my ...

Question

A line in my book. It describes aboab the feature of Aves.(a category of animals like mammalia etc...)
-Aves have two forelimbs that are modified for flight.

What do they mean so?

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Solution

Forelimbs of birds are modified into wings that help them to fly. These wings exert a downward force that helps the birds to lift up.

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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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