I believe the tennis ball would bounce the highest if you were to put equal force on each ball and throw it to the ground.
I don't know exactly why, but I tested this once, and it seems the tennis ball bounces the highest because of the fact that it has the most air pressure inside of it.
The highest level of organization a sponge has are Cells.
Not if it is an artificial sponge.
Felt, plastic, And Sponge. x
wood and trees
Yes, it is man made. A natural sponge is a sea creature that looked like what we call a sponge. Although still available, what most people call a sponge is man made of a soft plastic or foam like material.
you wash it with soap and water
No, since fabric is a textile made of fibers threaded together, whereas sponge is constructed of cellulose wood fibers, or a foamed plastic polymer.
easy two plastic screws under seat
Cloth, sponge rubber, metal, wood, plastic, etc.
YES! It can choke on the sponge very easily. Also, a store-bought sponge is made of plastic. If if gets into a guinea pig's stomach, it might vomit and have diarrhea. Bring to your vet immediately.
The seed pods have a plastic shell, inside the shell is a sponge that your seeds are placed in.
Your hands, soap and water (plus a cloth or sponge) is all you really need! :)