Sponges are sessile which means they are not able to move about. Sponges show so little movement that until the 18th century, they were considered as plants by the naturalists. Because most adult sponges are colonial and sessile, they can be easily harvested, and used for bathing, scubbing and drinking. They are brought up by divers in deep water, or raked in with long-handled forks in shallow water. However, there is a disadvantage to the sponge's non-motile characteristic. If there are no available food particles around the sponges, they won't be able to obtain enough energy to sustain themselves. Eventually, they will dry up and skeletons will remain.
DID YOU KNOW? Chemicals from sponges are being used to find a cure for cancer and other diseases!
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