During follicular phase changes in the ovary and the uterus are induced by chages in the levels of `ul((A))` and `ul((B))` hormones.

Answer

**Step-by-Step Solution:**

1. **Understanding the Follicular Phase:**
- The follicular phase is the first part of the menstrual cycle, starting from the first day of menstruation and lasting until ovulation. This phase is characterized by the growth and maturation of ovarian follicles.

2. **Identifying the Key Hormones:**
- The two primary hormones involved in the follicular phase are:
- **Follicle Stimulating Hormone (FSH):** This hormone is secreted by the anterior pituitary gland and stimulates the growth of ovarian follicles.
- **Estrogen:** As the follicles mature, they produce estrogen, which is crucial for the development of the endometrium in the uterus.

3. **Role of FSH:**
- FSH promotes the growth of ovarian follicles. As the follicles grow, they secrete increasing amounts of estrogen.

4. **Role of Estrogen:**
- The rise in estrogen levels leads to the proliferation of the endometrial lining in the uterus, preparing it for a potential implantation of a fertilized egg.

5. **Conclusion:**
- The changes in the ovary (follicle maturation) and the uterus (endometrial proliferation) during the follicular phase are primarily induced by the levels of **Follicle Stimulating Hormone (FSH)** and **Estrogen**.

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