Birds are able to fly while we humans can't fly. This is because the birds have less weight than humans. Why is their weight less?

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• A Birds have less weight due to feathers on body
• B Birds have less weight because they eat less food
• C Birds have less weight due to their hollow bones
• D Birds have less weight due to only 2 legs and no arms

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Answer: C. Birds have less weight due to their hollow bones

Birds have hollow bones which are very light. This helps birds fly up in the sky.

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