Suchi has a cow. Her teacher told her that cow is mammal because

Options

A. cow lays egg
B. cow gives birth to calf
C. in cow's body there is present skeleton of bones
D. All of the above

Explanation

To determine why Suchi's teacher told her that a cow is a mammal, we can break down the characteristics of mammals and how they apply to cows.

### Step-by-Step Solution:

1. **Definition of Mammals**:
- Mammals are a class of animals that are characterized by certain features. One of the key features is that they give birth to live young rather than laying eggs.

2. **Reproduction**:
- Unlike birds or reptiles that lay eggs, mammals, including cows, give birth to their young. In the case of cows, they give birth to calves, which are baby cows.

3. **Cows and Their Young**:
- When a cow gives birth, it does not lay eggs. Instead, it nurtures the developing calf inside its body until it is ready to be born. This is a defining characteristic of mammals.

4. **Skeletal Structure**:
- While cows do have a skeleton made of bones, this is not a unique characteristic that defines them as mammals. All vertebrates (animals with a backbone) have a skeleton, so this fact does not specifically classify cows as mammals.

5. **Conclusion**:
- Therefore, the reason Suchi's teacher stated that a cow is a mammal is primarily because cows give birth to live young (calves) instead of laying eggs.

### Final Answer:
Suchi's teacher told her that a cow is a mammal because cows give birth to live young (calves) instead of laying eggs.

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