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OpenStudy (anonymous):

1. A bird's nearly hollow bones help it to A. store extra oxygen. B. deliver oxygen to its cells. C. be lightweight in the air. D. defend itself against predators.

OpenStudy (anonymous):

C, but can people stop asking there homework here...

OpenStudy (anonymous):

thanks

OpenStudy (anonymous):

No probs

OpenStudy (anonymous):

be lightweight in the air, so that they can fly easily.

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