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alexdok [17]
3 years ago
13

Hurry

Biology
2 answers:
lesya692 [45]3 years ago
8 0

Answer:

They have hollow bones, so they are lighter.

Explanation:

hollow bones help with oxygen intake btw

Aleks [24]3 years ago
4 0

Answer:

They have smaller vessels

Explanation:

because If there heart works less,they won't have any problem having high heqatr rate

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