Which one of the following was not present when life began on earth?

Calcium

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Hydrogen and Nitrogen

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Water

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Carbon monoxide and Carbon dioxide

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Solution

The correct option is A Calcium
Abiogenesis, or informally the origin of life, is the natural process by which life arises from non-living matter, such as simple organic compounds. Since calcium is an inorganic compound, it was not present when life began on earth.

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