What day is considered to be the first day of a female’s 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.

The correct answer will be- When hormone levels are low and the uterus lining is shed

Explanation:

The reproductive cycle is the complex natural changes which take place in the Mammalia division of the animal kingdom.

The reproductive cycle is regulated and controlled by the levels of gonadotrophin hormones produced in the body which are LH and FSH.

The reproductive cycle takes place through coordination of ovarian and uterine cycle. The first day of the cycle begins on the day when the uterine cycle begins that is uterus endometrium layer starts to shed and is called menstrual.

Thus, the selected option is the correct answer.

age range would be the answer

a physical change is being made.