Answer:
(a) Bilateral Symmetry The left and right halves of the
body have same design in bilaterally symmetrical organisms, e.g.. Liver fluke.
(b) Coelom It is an internal body cavity between visceral
organs and body wall in which well-developed organ can be accommodated.
e.g.. Butterfly.
(c) Triploblastic Animals having three layers of cells from which
differentiated tissue can be made are called triploblasitc, e.g.. Starfish.
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