Question

what day is considered to be the first day of a females reproductive cycle?
when hormone levels are low and the uterus lining is shed.
when hormone levels are high and the uterus lining is shed.
when hormone levels are low and the ovary releases an egg.
when hormone levels are high and the ovary releases an egg.

Explanation:

The female reproductive cycle (menstrual cycle) begins with menstruation. During menstruation, hormone levels (such as estrogen and progesterone) are low, and the uterine lining (endometrium) is shed. Ovulation (when the ovary releases an egg) occurs later in the cycle (around day 14 in a 28 - day cycle), and at that time, hormone levels (especially luteinizing hormone) surge.

Answer:

When hormone levels are low and the uterus lining is shed.