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alternation of generations
Succession of sexually and asexually formed groups of offspring belinging to a given species of organisms; such as, microspheric and megalospheric foraminifers, polyps, and medusa stages of some coelenterates (invertebrate lacking a backbone or spinal column), etc.

Coelenterates are radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms.

This entry is located in the following unit: Geology or Related Geological Terms + (page 2)