Select the incorrect statements :

Options

A. Natural selection is a heritable variation & by reproduction leave greater number of progemy
B. During stabilisation of natural selection more individuals acquire value other than mean character value
C. By the time of 500 million years ago invertebrates were formed and were active
D. Reptiles lay thick shelled eggs which do not dry up in sun unlike those of Amphibians

Answer

To solve the question of selecting the incorrect statements, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Natural selection is a heritable variation and by reproduction leave greater number of progeny.**
- This statement is incorrect. Natural selection refers to the differential survival and reproduction of individuals due to differences in phenotype. While heritable variation is a component of natural selection, the phrasing of this statement is misleading.

2. **Statement 2: During stabilization of the natural selection, more individuals acquired value other than the mean character value.**
- This statement is incorrect. Stabilizing selection favors the average phenotype and reduces variation. Therefore, during stabilization, more individuals tend to acquire values closer to the mean character value, not away from it.

3. **Statement 3: By the time of 500 million years ago, invertebrates were formed and were active.**
- This statement is correct. Invertebrates were indeed present and active around 500 million years ago, during the Cambrian period.

4. **Statement 4: Reptiles lay thick-shelled eggs which do not dry up in the sun unlike those of amphibians.**
- This statement is correct. Reptiles do lay thick-shelled eggs that are adapted to prevent desiccation, unlike the more permeable eggs of amphibians.

### Conclusion:
The incorrect statements are:
- **Statement 1**: Natural selection is a heritable variation and by reproduction leave greater number of progeny.
- **Statement 2**: During stabilization of the natural selection, more individuals acquired value other than the mean character value.

### Final Answer:
The incorrect statements are **Statement 1 and Statement 2**.

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