Question

what do we mean by 'no body cavity between epidermis and gastrodermis'?​

Answer 1

In other words we, can say that the coelom or the body cavity is the space enclosed by the mesoderm where the internal organs are suspended. ... In acoelomate animals, the space between the gastrodermis(outer lining of the gut) and the epidermis is filled with unspecialised cells.i.e no body cavity is present