Glass sponges absorb silica out of the ocean and use it to grow, so they are literally made of glass. Their bodies have thousands of tiny holes, or pores, through which water constantly flows. They absorb all the food, oxygen, and silica they need straight from the water that surrounds them. They get rid of their waste straight back into the water, which they pump out through their tube-shaped “oscula” with the help of the surrounding water current. Through the above process they filter and clean the water. One more fun fact is that these animals were around when the dinosaurs were alive.
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