The sponge is considered the oldest animal phyla. They are multicellular, but have no tissues or organs. small pores are the gateway to a complex channel system where the sponge pumps a stream of water from which cells extract small particles of food.
What kind of organs do sponges have?
The sponge has no organs or organ system. They don't even have tissue, but they are organized only at the cellular level.
Does the sponge have an organ or organ system?
Since the sponge has no organ system, it has no respiratory or circulatory system. They acquire oxygen by diffusing from the water flowing through their bodies, and waste is expelled by diffusing into the same puddle. 2015
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