Animal classes {classification, animal} can depend on body organization.
cell differentiation
Animal cells differentiate into tissues and organs in patterns.
symmetry
Animals differ in symmetry: radial or axial.
body cavity
Animals differ in body cavity. Some animals have one cavity with mouth opening. Some animals have alimentary canal tube from mouth to anus, surrounded by coelom tube from mouth to anus.
segmentation
Animals differ in body-segment number and differentiation.
nervous system
Animals differ in body and nervous-system structure.
Biological Sciences>Zoology>Classification
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Date Modified: 2022.0224