A sponge is typically described as being closed at the bottom and open at the top. This structure allows water to enter through the top and circulate through the sponge's porous body, where it can filter food particles and oxygen. The closed bottom helps to anchor the sponge to the substrate on which it is growing.
Describe the body form of a sponge.
A sponge is closed at the bottom and open at the top.
A sponge is open at the bottom and closed at the top.
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