List some reasons of infertility.

Explanation

### Step-by-Step Solution for the Question: List Some Reasons for Infertility

1. **Physical Reasons**:
- Infertility can arise from anatomical or physical issues in either male or female reproductive systems. For instance, structural abnormalities in the uterus or ovaries can prevent successful conception or pregnancy.

2. **Congenital Conditions**:
- Certain congenital conditions can lead to infertility. Examples include Turner syndrome (where females have a single X chromosome, X0) and Klinefelter syndrome (where males have an extra X chromosome, XXY). Both conditions can result in infertility.

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