The smallest eggs belong to

Options

A. Mammals
B. Fishes
C. Amphibians
D. Reptilies .

Answer

**Step-by-Step Solution:**

1. **Understanding Oviparous and Viviparous Animals:**
- Oviparous animals lay eggs externally in the environment. Examples include birds, reptiles, amphibians, and most fish.
- Viviparous animals develop their young internally and give birth to live offspring. Mammals are primarily viviparous.

2. **Identifying the Options:**
- The options given are mammals, fishes, amphibians, and reptiles. We need to determine which of these groups has the smallest eggs.

3. **Characteristics of Mammalian Eggs:**
- Mammals are known for having very small eggs. In fact, the egg of a mammal is often referred to as an "egg cell" because it is essentially a single cell.
- The size of a mammalian egg is significantly smaller than the eggs produced by fishes, amphibians, and reptiles.

4. **Comparing Egg Sizes:**
- Fish, amphibians, and reptiles typically produce larger eggs compared to mammals. For example, fish can lay hundreds to thousands of eggs that are much larger than a mammalian egg.
- Amphibians also produce relatively large eggs, often in clusters, and reptiles lay eggs that are generally larger than those of mammals.

5. **Conclusion:**
- Based on the comparison and characteristics, the smallest eggs belong to mammals. Therefore, the correct answer is mammals.

**Final Answer:**
The smallest eggs belong to mammals.

---