Single and colonial coral polyps lead an attached lifestyle. What structural features are determined by their lifestyle?

1) Beam symmetry – branched body shape – the ability to catch prey, to defend from any side
2) Stinging cells – serve to defend and attack, focused on tentacles.
3) Skeletal support and protective formations. Lime skeleton – the support of the body, protection against damage, a device that makes the body more durable. Such skeletons are widespread among sedentary animals, for example, in the form of continuous internal skeletons, as, for example, in corals

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