Animals with 3 issue layers may be characterized by the presence or absence of a Coelom.
Explanation;
Animals may be characterized by the presence of a coelom, formation of the mouth, and type of cell cleavage during embryonic development.
Diploblasts contain two germ layers that is the inner endoderm and outer ectoderm, while triploblasts contain three germ layers, that is; endoderm, mesoderm, and ectoderm.
Triploblasts can be further categorized into those without a coelom called acoelomates, those with a true coelom called eucoelomates, and those with “false” coeloms known as pseudocoelomates.
