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First life on earth was

1. Cyanobacteria
2. Chemoheterotrophs
3. Autotrophs
4. Photoautotrophs

Correct answer: Chemoheterotrophs

Solution

The first life forms are thought to have been simple organisms that used existing organic compounds for both energy and carbon. That makes chemoheterotrophs the best choice, since they do not require sunlight or inorganic carbon fixation to survive.

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