Question

2. How is flying high helpful to the migratory birds ?​

Answer 1

Answer:

Flying birds gulp air, deriving oxygen to fuel their hard-working muscles. But this critical element is in short supply at high elevations, with only one-third to half the oxygen levels at sea level. ... Since flapping their wings saps energy, the birds glide once they reach cruising altitude.

Answer 2

Answer:

To flap their wings fast.

Explanation:

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