SPONGES

Sponges are aquatic animals; there are 5,000 to 10,000 species of sponges known.  Most of sponges live in salt water and only few of them in fresh water. Sponges eat tiny microorganism like plankton, especially because of their size, sponges are filter feeders, that means that sponges have an especial cell called choanocytes      that filters the water that have their food.

Most of sponges are hermaphrodites, but sometimes sperm from a sponge float through the water to an egg cell from another sponge and they create a new larva.