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What evolutionary change occurred in animal evolution such that animals had a "front" and "back," as well as right and left sides?
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What evolutionary change occurred in animal evolution such that animals had a "front" and "back," as well as right and left sides?

User Dfortun
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Bilateral symmetry-two-sided symmetry
-the animal has two axis of orientation: front to back and top to bottom
-have dorsal (top), ventral (bottom), anterior (front), and posterior (back) sides
hope this helps
User The Bassman
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