Respuesta :

Answer:

Flatworms (Platyhelminthes) are acoelomates i.e. they lack a coelom. 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.

Answer:

Earthworm is not kept in the phylum aschelmithes because it hasn't a cylindrical unsegmented body.

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