The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen.<span> </span>
The lymphatic system has multiple interrelated functions: It is responsible for the removal of interstitial fluid from tissues. It absorbs and transports fatty acids and fats as chyle from the digestive system. It transports white blood cells to and from the lymph nodes into the bones.
The elements are pure forms of matter that cannot be broken down into simpler substances.
I'd use the library, the encyclopedia and the Internet.
It would be Newton's "3rd" Law that explains why my hands hurt when I clap loudly, since this states that every action as an equal and opposite reaction.
