Assertion : Muatations are necessary for the survial to the species.
Reason : Lack of mutation gives a temporary advantage to a species in an uncyhanged environment.

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

To analyze the given assertion and reason, we will break down the concepts involved and evaluate their validity step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Mutations are necessary for the survival of the species."
- Mutations are random changes in the genetic material of organisms. They can lead to variations within a species, which can be beneficial, neutral, or harmful.

2. **Evaluating the Assertion**:
- While mutations can introduce beneficial traits that help species adapt to changing environments, they are not strictly necessary for survival. Some species can survive for long periods without mutations, especially in stable environments. Therefore, the assertion is **not entirely true**.

3. **Understanding the Reason**:
- The reason states that "Lack of mutation gives a temporary advantage to a species in an unchanged environment."
- In a stable environment where conditions remain constant, the existing traits of a species may be sufficient for survival. Thus, a lack of mutation might not disadvantage the species immediately.

4. **Evaluating the Reason**:
- The reason suggests that a lack of mutation can provide a temporary advantage, which can be true in a stable environment. However, this does not mean that mutations are unnecessary for survival in the long term. Over time, lack of genetic variation can make a species vulnerable to changes in the environment or diseases. Therefore, while the reason has some validity, it is also **not entirely accurate**.

5. **Conclusion**:
- Both the assertion and the reason are not entirely correct. Mutations can be beneficial for adaptation, but they are not strictly necessary for survival. Similarly, while a lack of mutation may provide a temporary advantage in an unchanged environment, it does not ensure long-term survival.

### Final Answer:
Both the assertion and the reason are false.

---