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Oxygen makes up approximately _______ percent of Earth’s atmosphere.

arealhero

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Oxygen makes up approximately _______ percent of Earth’s atmosphere.

Oxygen makes up approximately _______ percent of Earth’s atmosphere.
a. 5
b. 20
c. 50
d. 80
e. 90

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milestone23

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arealhero Author

wrote...

#2

9 years ago

This is perfect, thank you for the answer.

milestone23

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#3

9 years ago

Great!

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