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(A) During the early stages of Earth's formation,the atmosphere was reducing and lacked free oxygen $(O_2)$.Therefore,the first life forms that evolve

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Anaerobic

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(A) During the early stages of Earth's formation,the atmosphere was reducing and lacked free oxygen $(O_2)$.Therefore,the first life forms that evolved were anaerobic,as they could survive and perform metabolic activities without the presence of oxygen.Aerobic organisms evolved much later after the accumulation of oxygen in the atmosphere due to the activity of photosynthetic organisms like cyanobacteria.

The first life form that appeared on Earth during evolution was $.......$.

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