You may have a dried and colorless version of one of these sponges.... that you use in the bathroom or kitchen.
In the ocean, they come in a variety of shapes and colors.
Most sponges are small but some have the ability to grow to more than 6ft in diameter.
While very plant-like in appearance.... they are actually one of the oldest and simplest of marine animals.
Sponges have no organs or tissues as we know them. They are made up of a grouping of individual cells with pores at the surface of their skins and a series of channels running underneath.
They feed by drawing water in thru the pores and then filtering the nutrients from that water as it passes thru the channels, before being expelled.
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