Heat always flows from a place to a place.

Which are forms of nitrogen that are usable by humans

Match the digestive enzymes to the macromolecules they to digest. break down fats into glycerol and fatty acids break down carbohydrates into simple sugars break down nucleic acids into nitrogenous bases and simple sugars break down proteins into amino acids

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength