If a starfish possess 6 arms instead of 5 and goat has 4 horns instead of 20. These are the examples of:

Options

A. Variation
B. Metamorphosis
C. Biogenesis
D. Evolution

Answer

To solve the question, we need to analyze the examples provided: a starfish with 6 arms instead of 5 and a goat with 4 horns instead of 20. We will determine what these examples represent in biological terms.

### Step-by-Step Solution:

1. **Understanding the Examples**:
- A starfish typically has 5 arms. However, in this case, it has 6 arms.
- A goat usually has 2 horns, but here it is stated to have 4 horns instead of the expected number.

2. **Identifying the Concept**:
- Both examples illustrate a deviation from the normal or expected number of body parts (arms in the case of the starfish and horns in the case of the goat).
- This deviation indicates a difference in the phenotype of these organisms.

3. **Defining Variation**:
- In biological terms, variation refers to the differences between individuals in a population. This can be due to genetic differences (genotypic variation) or environmental influences (phenotypic variation).

4. **Analyzing the Options**:
- **Variation**: This is the correct choice, as the examples show differences in the physical characteristics of the organisms.
- **Metamorphosis**: This refers to a developmental change in an organism's life cycle (e.g., tadpole to frog) and does not apply here.
- **Biogenesis**: This term refers to the process of life arising from pre-existing life, which is not relevant to the examples given.
- **Evolution**: This involves changes in heritable traits over generations, which is not what is being illustrated in the examples.

5. **Conclusion**:
- The correct answer is **variation**, as both examples highlight differences in the physical traits of the organisms.

### Final Answer:
The examples of a starfish with 6 arms instead of 5 and a goat with 4 horns instead of 20 are examples of **variation**.