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As
the flagella of the cells inside the sponges beat the water, a current is set up
and water is drawn through the tiny pores into centre of the sponge and then
driven out through the hole at the top. Suspended particles of food in the water
are caught on the flagella of the cells and passed back to the amoeba- like
cells. Another function of these cells is to a absorb the food particles
filtered from the water and to transport the digested food to the other parts of
the sponge. The cells bearing flagella can only deal with a certain size of food
particle, and so no matter how large the sponge, it must feed on microscopic
particles such as bacteria and protozoa's suspended in the water.
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