Because the kidneys cant get rid of all toxins in the body.
Become strong, healthy, and or successful again after something bad happens.
another definition is
the ability of something to return to its original shape after it has been pulled, pressed, stretched, bent, etc
hope this is what you wanted
Kickball-Ball is rolled towards the batter and kicked
Softball- Ball is pitched in the air and struck by a bat
Whiffleball- Plastic ball struck by plastic bat