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2-минутный Правило hydra

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The nervous system of Hydra is a nerve net, which is structurally simple compared to more derived animal nervous systems. Hydra does not have a recognizable brain or true muscles. Nerve nets connect sensory photoreceptors and touch-sensitive nerve cells located in the body wall and tentacles. Later versions of the https://alank307zfj1.wikigiogio.com/user

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