Male- private parts are different, Males have sperm that contributes to the reproduction process, males give 23 chromosomes like female's
Female- private parts are different, female's contributes eggs to the reproduction process, female's give 23 chromosomes like male
It is only active at a pH of around 2 because that is around the same pH as the gastric juices in the stomach which is where pepsin is used to break down proteins.
