The theory of Natural selection that explains the appearance of new from of life on earth was given by :

Options

A. Oparin and Haldane
B. Hardy-Weinberg
C. Mendel
D. Darwin

Answer

To solve the question regarding who proposed the theory of natural selection that explains the appearance of new forms of life on Earth, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the individual who proposed the theory of natural selection, which is a key concept in evolutionary biology.

2. **Review the Options**: The options provided are:
- A) Oparin and Haldane
- B) Hardy-Weinberg
- C) Mendel
- D) Darwin

3. **Analyze Each Option**:
- **Option A (Oparin and Haldane)**: They are known for their work on the chemical origin of life, not natural selection. This option is incorrect.
- **Option B (Hardy-Weinberg)**: They are known for the Hardy-Weinberg principle, which deals with genetic variation in populations, but not natural selection. This option is also incorrect.
- **Option C (Mendel)**: Mendel is known for his laws of inheritance in genetics, which do not pertain to the theory of natural selection. This option is incorrect.
- **Option D (Darwin)**: Charles Darwin is credited with the theory of natural selection, which explains how new forms of life arise through variations that are advantageous for survival and reproduction. This option is correct.

4. **Conclude the Answer**: Based on the analysis, the correct answer is **D) Darwin**.

### Final Answer:
The theory of natural selection that explains the appearance of new forms of life on Earth was given by **Darwin**.

---