If you are investigating the rate of chemical reactions, which molecule would you study? Select one: a. lipids b. RNA c. DNA d. carbohydrates e. enzymes

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.