Sponges are very simple animals that live permanently attached to a location in the water.
The body of this animal has thousands of pores which let water flow through it continually. Sponges obtain nourishment and oxygen from this flowing water. The flowing water also carries out waste products.
Suck the water in, filter out the food, and send the water out.
These invertebrates range in size from a few millimeters to 2 meters tall.
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