GENERAL HISTOLOGY

Detailed explanation-1: -Coelom ates are organisms that have coelom or body cavity. Coelomate animals possess coelom between the body wall and digestive tract.

Detailed explanation-2: -The true coelom is a body cavity formed during embryo development from the three germinal layers. The body cavity meaning a fluid filled space that can accomodate organs. The coelom is lined by mesodermal epithelium cells. Presence or absence of coelom is one of the criteria for classifying animals.

Detailed explanation-3: -Coelomates are organisms with a fluid-filled cavity between the gut wall and the outer body wall. An acoelomate is an organism that does not contain a fluid-filled cavity in their bodies. Type of animal. Both vertebrates and invertebrates.

Detailed explanation-4: -The protostome coelomates (acoelomates and pseudocoelomates are also protostomes) include the mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, onychophorans, phoronids, brachiopods, and bryozoans. Deuterostomes include the chaetognaths, echinoderms, hemichordates, and chordates.