ASSERTION (A): Sponges have a water
vascular system with madreporite &
tube feets.
REASON (R): Water enters through
minute pores (ostia) in the body wall
into a central cavity, gastrocoel, from
where it goes out through the
osculum. This pathway of water
transport is helpful in food gathering
respiratory exchange and removal of
waste, Choanocytes or collar cells lines
the gastrocoel and the canals.
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