First life form on earth was a

Cyanobacterium

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Chemoheterotroph

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Autotroph

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Photoautotroph

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Solution

The correct option is B Chemoheterotroph
It is presumed that the first living individuals were chemoheterotrophs that obtained energy from breaking down of complex organic substances available to them in the sea where they originated.

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___ were the first form of life to appear on the Earth.

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