What are the structural features of coral polyps that provide them with an attached lifestyle?

1) Coral polyps in the ectoderm have stinging cells, upon irritation of which the stinging thread shoots and affects prey.
2) Numerous near-mouth tentacles help deliver nutrients to the intestinal cavity. In the endoderm, the captured food is processed by the digestive juices, which are secreted by the glandular cells.
3) The resulting gruel is phagocytosed by digestive cells. Digested residues are absorbed, but not digested – are removed from the body.

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