By using the changeable collagen tissue, the advantage that echinoderms have is that they save energy.
What is the mutable collagenous tissue?
The epidermis of echinoderms can stiffen or become more flexible according to the needs that the animal has, if the environment is favorable, it can remain more flexible, if it is too dangerous, it can become rigid.
This type of changeable connective tissue is controlled by the simple radial nervous system of echinoderms, one of which will stiffen and the other will soften the cellular matrix.
With this information, we can conclude that Echinoderms (Phylum Echinodermata) are marine animals that move slowly or are sessile. They have an endoskeleton formed by calcareous plates and, for the most part, have pointed projections (which come from this skeleton) and spines.
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