The presence of vestigial organs in man supports `:`

Options

A. natural selection
B. Germplasm theory
C. Evolution but not Lamarck's theory
D. Synthetic theory

Answer

To answer the question regarding the presence of vestigial organs in man, we can analyze the options provided step by step.

### Step-by-Step Solution:

1. **Understanding Vestigial Organs**: Vestigial organs are structures that have lost most or all of their original function through the course of evolution. In humans, examples include the appendix, wisdom teeth, and the tailbone.

2. **Evaluating the Options**:
- **Option 1: Natural Selection**: Natural selection refers to the process where organisms better adapted to their environment tend to survive and produce more offspring. Vestigial organs do not support this theory as they are remnants of structures that were once useful but are no longer advantageous.
- **Option 2: Germplasm Theory**: This theory posits that heredity is based on germplasm, which is independent of somatic cells. This theory does not explain the presence of vestigial organs, so it is not relevant to the question.
- **Option 3: Evolution (not Lamarck's theory)**: Evolution explains how species change over time through processes like natural selection and genetic drift. Vestigial organs are evidence of evolutionary history, showing that these structures were once functional in ancestors but have diminished in utility. Lamarck's theory, which suggests that organisms can pass on traits acquired during their lifetime, does not account for vestigial organs.
- **Option 4: Synthetic Theory**: This theory integrates Darwinian natural selection with Mendelian genetics. While it addresses evolution, it does not specifically relate to the concept of vestigial organs.

3. **Conclusion**: The presence of vestigial organs in humans supports the theory of evolution, specifically indicating that these organs are remnants from ancestors and have lost their original function over time. Therefore, the correct answer is **Option 3: Evolution (not Lamarck's theory)**.