What substances are present in birth control pills?

Explanation

**Step-by-Step Solution:**

1. **Understanding Birth Control Pills**: Birth control pills are medications taken by females to prevent pregnancy. They are commonly referred to as "pills."

2. **Hormones Present**: The primary substances found in birth control pills are hormones. The two main hormones are:
- **Progesterone**: This hormone can be present alone in some types of pills.
- **Estrogen**: In many birth control pills, a combination of both progesterone and estrogen is used.

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