what is blind sac body 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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 In this type of body plan only one opening is there for both ingestion and excretion or for mouth and anus same opening is used.  for example - coelenterata and ctenophora .

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it is the body plan i which there is a common passage for food as well as digestive waste. in short , when the mouth and the anus are the same.

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