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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.
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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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