Hydra – History, Biology, Characteristics and Reproduction 0:00 HYDRA educational film 0:08 History 2:50 The Body Structure of Hydra 5:40 Cell types 8:50 Nervous System 10:10 Cnidocytes 12:40 Respiratory and circulatory systems 13:15 Nutrition and digestion 14:50 Reproduction of Hydra 16:30 Hydra Symbiosis and Photosynthesis 17:40 Regeneration and immortality of hydra
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