justify why does a bird flap its wing to fly higher??​

Question

justify why does a bird flap its wing to fly higher??​

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Thanh Hà 6 months 2021-07-17T08:50:57+00:00 1 Answers 0 views 0

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    2021-07-17T08:52:50+00:00

    Answer:

    they use thermals and air currents to glide.

    Explanation:

    when they flap higher they use thermals and air currents  because flapping takes a lot of fuel,energy

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