Primitive animals typically exhibit no or radial symmetry, lack a distinct head, possess mesoglea instead of mesoderm, are acoelomate, may lack true tissues, and are often sessile.
Primitive animals typically exhibit no or radial symmetry, lack a distinct head, possess mesoglea instead of mesoderm, are acoelomate, may lack true tissues, and are often sessile.
| Front | Primitive Animal Development Characteristics |
|---|---|
| Back | - no symmetry or radial symmetry - no head - mesoglea, not mesoderm - acoelomate, no real tissues - sessile |
Tags: chapter_12
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