LOOPING in coelenterates: explain looping in cnidarians/hydra

-this is a form of locomotion in coelenterates such as hydra
-this occurs by the contraction of the ectodermal process
-and relaxation of the ectodermal fibres
-resulting in the body becoming shorter and wider
-endodermal contraction and ectodermal relaxation produce an elongated and narrow form
-movement is coordinated by stimuli, which spread through the nerve net.

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