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Sponges have a water transport or canal system which is helpful in:

( a ) food gathering and removal of waste
( b ) respiratory exchange and removal of waste
( c ) respiratory exchange
( d ) food gathering, respiratory exchange and removal of waste
Can you answer this question?
 
 

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(D) is the right answer.

Sponges have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste.
answered Jan 3, 2014 by pady_1
 

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