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Question

The first organisms were
  1. Primitive eukaryotes
  2. Aerobic bacteria
  3. Photosynthetic
  4. Prokaryotic heterotrophs

A
Primitive eukaryotes
B
Aerobic bacteria
C
Photosynthetic
D
Prokaryotic heterotrophs
Solution
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Prokaryotes were the first organisms to evolve on Earth, predating eukaryotes in the fossil record by about one billion years. Appearing on Earth 3.5 billion years ago, the first prokaryotes were probably heterotrophic bacteria. They cannot synthesize their own food. The first organism was probably too simple to do this and was probably dependent on complex organic substances for nutrition.
So, the correct answer is option C.

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