Class Hydrozoaregenerate {hydra}| (order Siphonophora) attach to substrates by epidermal-cell discs at opposite end from mouth, and are one centimeter long. They have asexual budding. In stagnant water, high carbon dioxide causes mating types. Hydra have nerve nets. Nervous system governs tissue patterns and regeneration. Hydra polypeptide also is in bovine and human hypothalamus.
Blue hydra {Portuguese man-o'-war} float and have tentacles.
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Date Modified: 2022.0225