Viviparity is considered to be more evolved because

Options

A. the yound ones are left on their own
B. the young ones are protected by a thick shell
C. the young ones are prtected inside the mother's bod and are lookea fter they are born leading to more chances of survival
D. the embryo takes a long time to develop.

Answer

### Step-by-Step Solution

1. **Understanding Viviparity**: Viviparity is a reproductive strategy where the young ones are born alive rather than hatching from eggs. This contrasts with oviparity, where animals lay eggs.

2. **Identifying the Options**: The question provides four options regarding why viviparity is considered more evolved:
- Option A: Young ones are left on their own.
- Option B: Young ones are protected by a thick shell.
- Option C: Young ones are protected inside the mother's body and looked after after they are born.
- Option D: Embryo takes a long time to develop.

3. **Analyzing Each Option**:
- **Option A** is incorrect because leaving young ones on their own is also seen in oviparous animals (like birds).
- **Option B** is also incorrect as it refers to the protection provided by egg shells, which is not relevant to viviparity.
- **Option C** is correct because it highlights that young ones are protected inside the mother's body during development and are cared for after birth, which enhances their survival chances.
- **Option D** is not a valid reason for considering viviparity more evolved, as the duration of embryo development does not directly correlate with evolutionary advancement.

4. **Conclusion**: The correct answer is **Option C**. Viviparity is considered more evolved because it allows for the young to be protected inside the mother's body during development and ensures they are cared for after birth, thus increasing their chances of survival.