Question

Why are forelimbs of birds modified?

Answer 1

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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Answer 2

Birds fall in a group of vertebrate animals that have four limbs also known as superclass tetrapoda. ... In birds, the fore limbs aremodified for flight and that is what we generally refer to as wings. The hind limbs aremodified for walking, perching or swimming