Please define the following terms:
Thank you in advance!
1. Body wall develops from two
embryonic germ layers- ectoderm and endoderms and persists as such in adult.
cellular, gelatinous mesogloea is present in between ectoderm and endoderm.
is absent, e.g. Hydra (coelenterates), sponges (Porifera).
develops from 3 germ layers- ectoderm,mesoderm and endoderms.
Mesogloea is absent and mesoderm is present.
is present, e.g. platy-helminthes, annelids, arthropods, mollusks, echinoderms
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