16. What is the coelom?To
which structures do coeloms
give birth? Are all animals
coelomate?

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Coeloms are cavities delimited
mesoderm. Coeloms originate the
where the internal organs the
body are located, the pericardial
cavity,the peritoneal the
pleural cavity.

Besides animals, there are
acoelomate , like
platyhelminthes, and pseudocoelomate
, like nematodes.