The first organisms were:

Chemoautotrophs

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Chemoheterotrophs

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Autotrophs

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Eucaryotes

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Solution

The correct option is B Chemoheterotrophs
The first life form, bacteria like prokaryotic cells, originated from protocell in the Archaeozoic era and were anaerobic chemoheterotrophs that used the organic component as a source of energy and carbon.
So, option B is the correct option.

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