How can you investigate the movement of water in a Sponge in the laboratory?

Small and tube shaped, water enters the sponge through dermal pores and flows into the atrium. Choanocyte flagella create the current to expel it through a single osculum. ... Water flowing in through incurrent canals is selectively pumped through those chambers which are, and expelled via one of a series of oscula.

Explanation:

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b.have there own function.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.