how do birds fly even though their is gravity in the earth
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Explanation:
Yes, gravity is pulling it down, but look at its wings; they're flapping, which provides lift and thus there is an upward force. Sometimes, smaller birds only flap their wings for part of the time in flight; the rest of the time, they pull their wings tightly to their body, to reduce drag.
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Answer:
Because they have hollow body and streamless body
Explanation:
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