The first organism that appeared on the earth was ___________.

unicellular

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bicellular

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tricellular

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multicellular

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Solution

The correct option is A unicellular
The first organism that appeared on the earth was single celled or unicellular organism. It first appeared on Earth almost four billion years ago. Bacteria have been the very first organisms to live on Earth. They made their appearance in the waters of the first oceans.

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