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. II is correct but I is false
B. Both I and II are correct
C. Both I and II are false
D. I is correct but II is false

Explanation

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
The first statement claims that "the earliest organisms that appeared on the earth were nongreen and presumably anaerobic."

- **Explanation**: The earliest life forms on Earth are believed to have been anaerobic because the atmosphere was reducing and lacked free oxygen. These organisms could not rely on oxygen for survival. Additionally, they were likely non-green because photosynthesis, which involves the use of sunlight and chlorophyll (the green pigment), is a complex process that would not have been present in the earliest life forms.

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

- **Explanation**: This statement is also accurate. The first autotrophic organisms were indeed chemoautotrophs, which derive energy from chemical reactions involving inorganic substances, rather than from sunlight. These organisms, such as certain sulfur bacteria, did not release oxygen as a byproduct because they did not perform photosynthesis, which is the process that typically produces oxygen through the splitting of water molecules.

### Step 3: Conclusion
Both statements are correct based on our understanding of the origin of life. The earliest organisms were anaerobic and non-green, and the first autotrophic organisms were chemoautotrophs that did not release oxygen.

### Final Answer
Both statements are correct. Therefore, the correct option is **D**.

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