Define blind sac body plan
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*Blind sac plan includes animals having just a single pore opening to the exterior in their digestive system. Food is taken in and the undigested food leave the body through a common pore. Division of labour is exhibited by the cells. e.g. Coelenterates and Flat worms.
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Blind San plan:-
In this plan, the body is sac like with a digestive cavity which opens to outside by only one aperture, which functions as mouth and anus. The cells are more specialised with division of labour. This type of type of body organisation is exhibited by coelenterates and flat worms.
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