Body Symmetry.

Explanation

(i)If body of any animal is cut through an imaginary axis, it may or may not produce two equal halves. Depending upon this property, these are different type of animal bodies.
(ii) In some animals, there is no such imaginary axis of the body through which we can get two equal halves. Such a body is called as asymmetrical body e.g. Amoeba, Paramoecium, some sponges.
(iii) In some animals, if imaginary cut passes through the central axis but any plane of the body, it gives two equal halves. Such a symmetry is known a radial symmetry e.g. Starfish.
(iv) In some animals, there is only one imaginary axis of body through which we can get equal halves. It is known as bilateral symmetry. e.g. Insects, fish, frog, birds, human, etc