The sponge was regarded as a plant until 1765 C.E., when scientists noticed while examining a living sponge, that water entered its side pores and exited through an upper opening in a continuous fashion, whereupon it was suspected that the creature being examined was a living animal.
In 1852 C.E., the scientist, Robert Grant, included the sponge in its current classification as an animal species.
There are some sponges which are very small and can only been seen with difficulty, and others which are very big. Their colors also vary; they may be yellow, green, orange, red or blue.
The sponge has numerous small orifices on its body, and at the top there is a wide opening. Water enters, bringing with it living beings and nutrients through the side openings, and the leftovers are expelled from the upper opening. Hence, it differs from all other living creatures in that its main, upper orifice is used not to take in nutrients but to expel waste.
[from "Scientific Miracles in the Oceans & Animals" by "Yusuf Al-Hajj Ahmad", published by Darussalam, 2010]
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