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1. Cnidarians have a central gastro-vascular cavity 2. They have a single opening, mouth or hypostome. 3. Digestion is extracellular 4. Digestion is intracellular. Regarding 1,2,3 and 4:

( a ) 4 is incorrect; 1,2 and 3 are correct
( b ) 1 and 3 are incorrect; 2 and 4 are correct
( c ) All are correct
( d ) 3 is incorrect; 1,2 and 4 are correct
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(C) is the right answer.

Cnidarians have a central gastro-vascular cavity with a single opening, mouth on hypostome. Digestion is extracellular and intracellular.
answered Mar 20, 2014 by pady_1
 

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