Answer:
I think it's A correct me if am wrong am not that smart am sorry if am wrong
Well it's thought that the oxygenation of the atmosphere contributed to the evolution
What is the question your trying to have answered?
The body wall<span> of a star fish is made up of a thin cuticle, an epidermis with a single layer of cells, a thick dermis composed of connective tissue and a thin coelomic myoepithelial layer, which allows the longitudinal and circular musculature.</span>
