Advantanges of a liquid fuel over solid fuel

Based on the position vs. time graph which velocity vs. time graph would correspond to the data

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?

The biosphere of the earth is made up of what compound? organic or inorganic?