The nervous system is the highly complex part of an animal that detects environmental changes that impact the body and send signals from one cell to others.
(I) The polyp, when present, is without the strongly developed longitudinal retractor muscles, forming ridges (taeniolae) projecting into the digestive cavity, seen in the scyphistoma or scyphopolyp. (2) The medusa, when' present, has a velum and is hence said to be craspedote; the nervous system fo
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