10. Why human cannot breathe normally in space?

No oxygen.

Explanation:

Just try to breathe in an oxygen-free enviroment. It's a most unpleasant experience.

:)

there is no oxygen in space

Explanation:

the only gas that is in space is helium. And helium cannot be used in the gaseous exchange if humans

um i think it might be a car?

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl