Why are ostia important to sponges

Sponges don't have internal organs. They don't have muscles, a nervous system, or a circulatory system. Their walls are lined with many small pores called ostia that allow water flow into the sponge. ... Sponges are able to get microorganisms such as algae and bacteria for food through openings.

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.

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