Which organ gives our body the sense to touch, protects it, and helps keep it at the right temperature? will make brainlest

a. skin
b. heart
c. liver
d. spleen

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.