The first living form resulting from the final stage of chemical evolution of life is called

Options

A. Prebiont
B. Protobiont
C. Protenoid
D. Probiont

Answer

**Step-by-Step Solution:**

1. **Understanding Chemical Evolution**: The question refers to the first living form that emerged from the final stage of chemical evolution. Chemical evolution is a theory proposed by scientists Oparin and Haldane, which suggests that life originated from non-living chemical compounds.

2. **Conditions on Early Earth**: The early Earth had a reducing atmosphere, characterized by the absence of free oxygen. It was rich in gases such as methane (CH4), ammonia (NH3), and hydrogen (H2). High temperatures and frequent volcanic activity contributed to the formation of organic molecules from these inorganic compounds.

3. **Formation of Organic Compounds**: Under these extreme conditions, the inorganic gases combined and formed organic compounds. This process involved the aggregation of these molecules into more complex structures.

4. **Emergence of Protobionts**: The aggregates of organic compounds eventually formed life-like structures known as protobionts. These protobionts are considered the first living forms because they exhibited characteristics similar to living cells.

5. **Characteristics of Protobionts**: Protobionts were likely heterotrophic (relying on organic compounds for nutrition) and anaerobic (not requiring oxygen for survival).

6. **Conclusion**: Therefore, the first living form resulting from the final stage of chemical evolution is referred to as "protobiont."

**Final Answer**: The first living form resulting from the final stage of chemical evolution is called **protobiont**.

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