Answer:
(b) When body cavity is
not completely lined by the mesoderm instead it is present in the form of
scattered pouches, in between ectoderm and endoderm, this type of body cavity
called pseudocoelomate, e.g., roundworm.
Acoelomates the
animals in which coelom is completely absent as, e.g., flatworms.
Coelomates
have their body cavity lined by mesoderm and hence have true coelom, e.g.,
annelids, molluscs, arthropods, etc.
Haemocoelomates
are the animals in which body cavity is filled with haemolymph, e.g.,
arthropods, molluscs.
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