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| the continuous sequence of changes undergone by an organism from one primary form, as a gamete, to the development of the same form again |
| a microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane, the basic structural unit of all organisms |
| sibling species (sĭb'lĭng) Pronunciation Key
Any of two or more related species that are morphologically nearly identical but are incapable of producing fertile hybrids. Sibling species can only be identified by genetic, biochemical, behavioral, or ecological factors, and are thought to have become divergent very recently. |