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  • The arrangement of body parts in an organism is known as symmetry. Classify organisms based on symmetry.

The arrangement of body parts in an organism is known as symmetry. Classify organisms based on symmetry.

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Organisms classfied on the basis of symmetry are :

1. Radial Symmetry - Radial symmetry is the arrangement of body parts around a central axis, like rays on a sun or pieces in a pie. Radially symmetrical animals have top and bottom surfaces, but no left and right sides, or front and back. Examples of radial symmetry organisms are - sea anemones , comb jellies , corals etc.

2. Bilateral Symmetry - Bilateral symmetry involves the division of the animal through a  plane, resulting in two mirror-image that is  right and left halves.Animals with bilateral symmetry have a head and tail front and back and right and left sides. Examples of  bilateral symmetry organisms are - Butterfly , crab or human body. 

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Ritika Jonwal

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