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In "Journey to the Microcosmos: Hydra--Stretchy, Speedy, & Probably Immortal," viewers explore the biology of hydra, tiny freshwater cnidarians related to jellyfish and sea anemones. The video explains hydra anatomy, including tentacles, a central digestive cavity, and nematocysts that fire with extreme speed to capture prey. It also highlights feeding, neurotoxin injection, digestion, and the symbiotic relationship between green hydra and algae through photosynthesis. A major focus is hydra regeneration, stem cells, and the scientific idea of negligible aging, which has led researchers to study whether hydra may be biologically immortal. This microscopy-based life science video supports curriculum topics in biology, cells, invertebrates, ecology, and animal structure and function. Part of the "Journey to the Microcosmos" series.
