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What is an animal?. Animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers. How do animals differ from plants?. Animals lack cell walls and have have collagen as their most abundant protein. Animals have nerve and muscle cells.
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Animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers.
How do animals differ from plants?
Animals lack cell walls and have have collagen as their most abundant protein. Animals have nerve and muscle cells. Animals have three distinct cell junc- tions: tight junctions, desmosomes, and gap junctions.
A Traditional View of Animal Diversity Based on Body-Plan Grades
Body Symmetry in Animals
Body Plans of the Bilateria
Protostomes vs. Deuterostomes
Figure 47.6x Sea urchin development, from single cell to larva