Discussion
During the evolution of life, the first formed cells were :
Answer: D
The first cells were Chemoheterotrophs.
On the classical Oparin-Haldane account, which this question follows, the first cells arose in a 'primordial soup' rich in organic molecules made abiotically. They used those ready-made molecules as both energy and carbon source, anaerobically, which makes them chemoheterotrophs.
Photoautotrophs needed the more complex machinery of photosynthesis and came later. Saprotrophs feed on dead organisms, which could not exist before life did. Chemoautotrophs, which build organic matter from inorganic chemicals, are favoured by some newer theories but are not the textbook answer.
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