mahaynaitline4d mahaynaitline4d

09-12-2015
Social Studies

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Why is Earth's current atmosphere made up mostly of nitrogen and oxygen?
a. Earth is eroding.
b. Earth is warming up.
c. Earth is continuing to cool.
d. Earth has living things on the surface.

Respuesta :

lobster lobster

09-12-2015

The answer is D bc we humans need oxygen to breath.

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