Name the organ that helps in nutrition in Hydra
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https://www.meritnation.com/ask-answer/question/what-is-the-mode-of-feeding-in-hydra/nutrition-in-animals/10195989
https://www.meritnation.com/ask-answer/question/what-is-the-mode-of-feeding-in-hydra/nutrition-in-animals/10195989