Symmetry: Animals can be categorised on the basis of their symmetry. Sponges are mostly asymmetrical, i.e., any plane that passes through the centre does not divide them into equal halves.
Types of Symmetry
Radial symmetry: A symmetry where any plane passing through the central axis divides the body into two equal halves is called the radial symmetry. Examples are Coelenterates, ctenophores and echinoderms.
Bilateral symmetry: In bilateral symmetry, only a single plane divides the body into two equal halves, e.g. Annelids, Arthropods, Molluscs, etc.
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