True or False. Animals vary tremendously in structure. Nevertheless, they can be categorized into a few basic body plans based on body symmetry, number of embryonic germ layers, type (or absence) of body cavity, and characteristics of embryonic development.

True

Explanation:

Animals can be categorized into 3 based on body symmetry

Those without any body symmetry (asymmetrical) Those with bilateral body symmetry (bilateria) Those with radial body symmetry (Radiata)

Animals can be categorized into 2 based on number of embryonic germ layer;

Those with two layers - endoderm and ectoderm (diplobastic) Those with three layers - mesoderm in addition to ectoderm and endoderm (triploblastic)

Animals can be categorized based on presence/absence of body cavity or coelom;

No body cavity - acoelomates False body cavity - pseudocoelomates True body cavity - coelomates

Animals can be categorized into 2 based on characteristics of embryonic development;

Deuterostomes Protosomes