EVERYDAY SCIENCE

Detailed explanation-1: -The coelom of an earthworm is its body cavity. It has a true coelom.

Detailed explanation-2: -The earthworms are protostomian animals possessing true coelom cavity filled with coelomic fluid that not only forms a stable hydrostatic skeleton but also includes many cells of the immune system, coelomocytes and humoral factors (Bilej et al.

Detailed explanation-3: -three animal phyla that possess true coelom are: Annelida, Arthropoda, Chordata.

Detailed explanation-4: -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-5: -Molluscs and insects (Arthropoda) are coelomates as they have a true coelom derived from the germ layer mesoderm. Roundworms (Aschelminthes) are pseudocoelomates as the coelom is not derived from the mesoderm.