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Introduction

Which one is ...

Question

Which one is present today but was absent about 3 to 5 billion years ago?

A

N_{2}

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B

O_{2}

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C

H_{2}

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D

Both A and B

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Solution

The correct option is D Both A and B
Oxygen has not always been as abundant as it is today.About 3-5 billion years ago the earth's atmosphere mostly comprised of hydrogen $C H_{3}$ , and carbon dioxide.It is believed that for the half of the Earths first 4.6 billion year history, the atmosphere contained almost no oxygen.

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