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| a mature sexual reproductive cell, such as a sperm or egg, that unites with another cell to form a new organism |
| the continuous sequence of changes undergone by an organism from one primary form, as a gamete, to the development of the same form again |
catagenesis cat·a·gen·e·sis (kāt'ə-jěn'ĭ-sĭs)
n.
See involution.