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3 votes
What gas important to life was absent from earth’s earliest atmosphere?

A.
oxygen







B.
methane







C.
carbon dioxide







D.
nitrogen

User Tajuana
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1 Answer

5 votes
We use this gas for breathing. It is all over the air. Plants gives us this gas also. It is part of what makes us alive. Therefore, the gas is called Oxygen.
User Albert Paul
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