Question

Water flows through the body of the sponge in the direction the arrow points in this illustration. how does water move through a sponge?

Answer 1

Cells in the sponge walls filter food from the water as the water is pumped through the body and the osculum ("little mouth"). The flow of water through the sponge is in one direction only, driven by the beating of flagella which line the surface of chambers connected by a series of canals.

Answer 2

The correct answer is in through the pores and out through the osculum