Why are ostia important to sponges?
a. They pull water into the sponge through the beating of their flagella.
b. They are large openings in the sponge that allow the waste to exit.
c. They are the pores through which water, sperm, and food enter the sponge.
d. They are what the gel is composed of that connects all the different cells of the sponge together.
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Why are ostia important to sponges?
a. They pull water into the sponge through the beating of their...
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