Question

the birds bone are filled with​

Answer 1

Answer:

Birds bones are filled with air cavity. In some bones, the hollow cavities contain extensions of air sacs from the lungs. These air sacs help the bird to get oxygen to fly higher, quickly and easily.

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Answer 2

the birds bone are filled with air .

It also has some cross-sections of bone, called struts, that make the bone strong and help birds withstand taking off, flying and landing.