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Define terms and one examples of each (a...

Define terms and one examples of each (a) Bilateral symmetry, (b) Coelom, (c) Triploblastic.

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(a) Bilateral symmetry. It is a type of body symmetry in which appendages and organs of the body are paired with one of each pair being present in right and left halves of the body. It is an adaption of motile life style, e.g., Frog/Lizards/Sparrow/Human being
(b) Coelom. It is a mesoderm lined, fluid-filled internal body cavity that provides a shock proof environment to the contained body organs, e.g., annelids, chordates
(c) Triploblastic. They are animals having three germinal layers- outer ectoderm, middle mesoderm and inner endoderm, e.g., live fluke/Ascaris/Pheretima/house fly/star fish/Amphixus/cat.
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