Encrusting sponges are similar to moss because they tend to cover the surfaces of rocks. Free-standing sponges have lots of inner volume compared with their surface area. Sometimes, they grow into strange shapes and gigantic sizes. Because of their strange and large shapes, free standing sponges are best known to people. The barrel sponge, a tropical sponge, can grow large enough to fit a person inside of it.
Tube sponges are well known for very varied coloration.
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