Question

How are animals are classified based on the nature of body cavity give one example for each of the category?

Answer 1

acoelomates do have body cavity between
body wall and digestive track filled with paranchymatous Tissue
pseudocoelomate they have no body cavity BTW body wall and digestive track but this cavity does not a raise from mesoderm and not lined by epithelial tissue.
coelomate are true body cavity or coelom. which originates from mesoderm and lined by epithelial tissue from mesodermal orgin