7000 chemicals. ..........
Light-sensitive cells in the retina at the back of our eye allow us to see. The human eye has two types: cones and rods. Rods are extremely efficient; a tiny amount of light can trigger them. They are responsible for our night vision.
C is the answer hope i helped
Answer:
Female disorder:
Polycystic ovary syndrome: It is a condition in which the ovaries dysfunction occurs and the egg is not able to be released from the ovaries in a normal manner. This condition is caused due to several hormonal changes.
Male disorder:
Over heated testicles: Due to undescended testicles, the sperms are not produced correctly and hence cannot perform their function. Such conditions lead to Immobile sperms. Hence, leading to infertility.