Question

Fill in the blanks with appropriate words .
Primitive life was .......... in nature

Answer 1

It is thought that the most ancient type of respiration is anaerobic. Since there was little to no oxygen present when the first eukaryotic cells evolved through endosymbiosis, they could only undergo anaerobic respiration or something similar to fermentation.

So, the correct statement is 'Primitive life was anaerobic in nature'