Differentiate between internal fertilization and external fertilization.

Explanation

### Step-by-Step Solution:

1. **Definition of Fertilization**:
- Fertilization is the process where male and female gametes fuse to form a diploid cell known as a zygote.

2. **Internal Fertilization**:
- Internal fertilization occurs inside the body of the female.
- The male gametes are introduced into the female body through a copulatory organ.
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