State two differences between internal and external fertilization.

Explanation

To answer the question about the differences between internal and external fertilization, we can break it down into clear points:

### Step-by-Step Solution:

1. **Definition of Internal Fertilization**: Internal fertilization is the process where the fusion of male and female gametes occurs inside the female's body. This is typical of many terrestrial animals, including mammals, birds, and reptiles.

2. **Definition of External Fertilization**: External fertilization is the process where the fusion of male and female gametes occurs outside the bodies of the parents. This is commonly seen in aquatic animals such as fish and amphibians.

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