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Most animals are symmetrical in their body plans, which doesn't necessarily mean that they are perfectly symmetrical.

Humans for instance, have two, you can place a mirror right in the middle of a person and it will produce an image of the corresponding side. Humans and most mammals are said to be bilateral (two sides).


Starfish for instance have more than two, they have radial symmetry.


Some members of the animal kingdom do not have any symmetry in their body plans. A good example would be the more primitive of animals, the Poryphera (sponges). Sponges are asymmetrical (do not have symmetry).

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12y ago

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