What is the body of the sponge?

first of all, there is two types of sponges. one of them are when you take them and clean the dishes or toilet, tub. The other 1 is where it lives under water. And you can learn that in class when, you are doing science. "Grade 6 Diversity Of life". the other 1 you can learn in grade 1, 2 or kindergarden, preschool.