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First autotrophs were...

First autotrophs were

A

Anaerobic

B

Aerobic

C

Oxygenic but anaerobes

D

Mixed

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Autotrophs:** - Autotrophs are organisms that can synthesize their own food from inorganic substances. They do not rely on other organisms for nutrition. 2. **Identifying the First Autotrophs:** - To determine the first autotrophs, we need to consider the conditions of early Earth when life began. 3. **Analyzing Early Earth Environment:** - The early Earth had a reducing atmosphere, which means it lacked free oxygen. This environment was conducive to the survival of certain types of organisms. 4. **Determining the Type of Autotrophs:** - Given that there was no oxygen present, the organisms that could survive in this environment would be anaerobic. Anaerobes are organisms that do not require oxygen for growth and can thrive in such conditions. 5. **Conclusion:** - Therefore, the first autotrophs were anaerobes, as they were able to synthesize their own food in an oxygen-free environment. **Final Answer:** - The first autotrophs were anaerobes. ---
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