Pick the odd one out.

Options

A. Cat
B. Cow
C. Dog
D. Fish

Answer

**Step-by-Step Solution:**

1. **Identify the Options**: The question asks to pick the odd one out from a set of four animals. The animals mentioned are cat, cow, dog, and fish.

2. **Categorize the Animals**:
- Cat, cow, and dog are all terrestrial animals, meaning they live on land.
- Fish, on the other hand, is an aquatic animal, meaning it lives in water.

3. **Examine the Type of Fertilization**:
- Cat, cow, and dog all reproduce through internal fertilization, where fertilization occurs inside the female's body.
- Fish reproduce through external fertilization, where eggs and sperm are released into the water and fertilization occurs outside the body.

4. **Compare and Conclude**:
- Since cat, cow, and dog share the characteristics of being land animals and having internal fertilization, while fish is different as it is an aquatic animal with external fertilization, fish is the odd one out.

5. **Final Answer**: Therefore, the odd one out is **fish**.

---