Final answer:
The three major sub-classes of mammals have different reproductive processes. These include oviparity, viviparity, and ovoviviparity, as well as external fertilization, internal fertilization, and asexual reproduction. The reproductive processes also involve copulation, gestation, and parturition.
Step-by-step explanation:
The three major sub-classes of mammals have different reproductive processes:
A) Oviparity, Viviparity, and Ovoviviparity
Oviparity refers to the development of an embryo within an egg outside the mother's body. This occurs in most amphibians, reptiles, and birds. Viviparity is when the embryo develops inside the mother's body and is nourished through a placenta. This is the method used by most mammals, including humans. Ovoviviparity is a combination of oviparity and viviparity, where the eggs develop inside the mother's body but are not directly nourished by a placenta. Instead, the yolk of the egg provides nourishment.
B) External fertilization, Internal fertilization, and Asexual reproduction
External fertilization is when the sperm and egg meet outside the bodies of the parents. This method is used by many aquatic species. Internal fertilization is when the sperm and egg meet inside the female's body. This method is used by most terrestrial species, including mammals. Asexual reproduction is when an individual produces genetically identical offspring without the need for fertilization. This method is used by some organisms, but not by mammals.
C) Copulation, Gestation, and Parturition
Copulation is the process of sexual intercourse, where the male and female reproductive organs come into contact for the transfer of sperm. Gestation is the period during which the embryo develops inside the mother's body. Parturition is the act of giving birth, where the fully developed offspring is expelled from the mother's body.