How do structures in an organism telate to their function?

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What metric units would you use to measure the thickness of a key