Refer to Animation: Cell Signaling. When cells communicate by the signaling process, one cell produces a that must be received by the on or in the responding cell.

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

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?