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Why is it hard to breathe at the top of Mt. Everest?

GOOD2Know17

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6 years ago

Why is it hard to breathe at the top of Mt. Everest?

Why is it hard to breathe at the top of Mt. Everest?

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Bboggie17

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GOOD2Know17 Author

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6 years ago

You make an excellent tutor!

Kstan109

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Yesterday

Thanks for your help!!

jamiebonf99

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2 hours ago

Good timing, thanks!

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