Final answer:
Jellyfish exhibit the medusa body form, while polyps have a different structure, showcasing the diversity in form among marine organisms.
Explanation:
Jellyfish exhibit the medusa body form, characterized by a bell-shaped structure with hanging mouth and tentacles, allowing them to be motile in water. In contrast, polyp forms, like Hydra spp., are sessile with a single opening to the digestive system facing up, surrounded by tentacles. This distinct body plan exists in the phylum Cnidaria, showcasing the diversity in form among these marine organisms.
Learn more about Cnidarian body forms here:
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