Metals are made up of layers of positively charged kernals so when we hit it it slides over each other and keep on expanding
I think it might be a gas was formed.
Hope I'm right and it helps you out!!
Answer:
D) An acid group present in lipids
A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27<span> kg.</span>