Following are the two statements regarding the origin of life
(a) the earliest organisms that appeared on the earth were nongreen and presumably anaerobic
The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of following options is correct

Options

A. Both a and b are false
B. a is correct but b is false
C. b is correct but a is false
D. Both a and b are correct.

Answer

To determine the correctness of the two statements regarding the origin of life, we will analyze each statement step by step.

### Step 1: Analyze the First Statement
**Statement A:** "The earliest organisms that appeared on the earth were nongreen and presumably anaerobic."

- **Explanation:** The earliest life forms on Earth were indeed non-green and anaerobic. This is because the primordial atmosphere lacked oxygen, which meant that these organisms could not use oxygen for respiration. They were heterotrophic anaerobes, meaning they could not produce their own food and relied on organic compounds available in their environment, primarily in the oceans.

**Conclusion for Statement A:** This statement is **true**.

### Step 2: Analyze the Second Statement
**Statement B:** "The first autotrophic organisms were the chemoautotrophs that never released oxygen."

- **Explanation:** The first autotrophic organisms were indeed chemoautotrophs. These organisms obtained energy through the oxidation of inorganic substances, rather than through photosynthesis (which requires sunlight). During the time these organisms emerged, the atmosphere was still low in oxygen, so they did not release oxygen as a byproduct of their metabolic processes. It was only later that photoautotrophs, like green plants, evolved and began to release oxygen through photosynthesis.

**Conclusion for Statement B:** This statement is also **true**.

### Final Conclusion
Both statements A and B are correct. Therefore, the correct option is that both statements are true.

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