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Question

Birds can fly in the air because they

A
Are small
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B
Are lighter than air
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C
Push more air behind
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D
All of these
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Solution

The correct option is D Push more air behind
The birds can lift their body and fly in the air due to the capability that the wings have the structure to push the air in the backward direction. This allows the bird to fly upward and forward by applying force and moving the air back.
Thus, the correct answer is option C.

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