The testes in males store sperm and the ovaries in females store eggs. During human sexual reproduction the male penis ejaculates into the female vagina. This releases the sperm into the uterus. Sperm contains sperm that find one or more eggs in the female and fertilize them. When an egg is fertilized by a sperm, no other sperm can enter it because its outer surface hardens. When this happens, it will undergo mitosis and develop into a baby. Human development and reproduction are influenced by things like hormones and the environment. Some of the hormones affected are progesterone, testosterone and estrogen. “Progesterone is produced by the corpus luteum in the empty ovarian follicle.” (Rodger, 2013, Par11) Progesterone maintains the lining of the uterus, so if fertilization occurs the fetus will be protected. “Testosterone is produced in the male testes and stimulates male characteristics.” (Rodger, 2013, Par14) Estrogen is produced in the female ovaries. “Estrogen stimulates female characteristics and strengthens the lining of the uterus.” (Rodger, 2013, Par19)Other systems...