The freshwater hydra is a small coelenterate animal that lives in lakes and rivers. It has a very simple structure. Its body has the shape of a cylinder, which at one end is attached to some surface by means of a sole, and at the opposite end there is a mouth, which is surrounded by tentacles. Fertilization is internal. The peculiarity of her life is that this animal is capable of regeneration. This process is possible with the help of special cells that are located in the ectoderm. Food enters through the mouth into the intestinal cavity, which ends with an opening through which metabolic products are excreted.
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