Answer :
Have a body cavity completely lined by mesodermal tissue whereas pseudocoelomates do not.
A pseudocolor is a coelom located between mesodermal and endoderm tissues and not completely surrounded by mesodermal tissue. The true coelom is completely surrounded by mesodermal tissue and thus can be divided into compartments. Coelomate Annelida strains contain segmented worms and include earthworms and leeches.
The most distinctive feature of the torso is metamerism the division of the body into similar parts or segments arranged in a linear array along the anterior-posterior axis of the torso. The advantage of body cavities is that the fluid-filled cavities around the organs create a hydrostatic skeleton to aid movement, allowing more efficient circulation of nutrients and removal of waste products.
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