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Q.

The first organisms were _____________.

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a

Photosynthetic.

b

Primitive Eukaryotes.

c

Aerobic bacteria.

d

Prokaryotic chemoautotrophs.

answer is C.

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Detailed Solution

  • The primary life forms that showed up on soil taken after single-celled life shapes called archaea that can live in extraordinary situations such as hot springs and deep-sea vents. 
  • They were prokaryotic heterotrophs and utilized inorganic chemicals from the environment for carbon obsession, and this handle is called chemoautotrophy. 
  • They were anaerobic in nature since free oxygen was truant amid primitive environments on the soil.
  • After chemoautotrophs, chemoheterotrophs existed on the earth.
  • Hence, the correct answer is option C.
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