common white dogwood: deciduous tree; celebrated for its large white or pink bracts and stunning autumn color that is followed by red berries
organism: a living thing that has (or can develop) the ability to act or function independently
dalton's law: (chemistry and physics) law stating that the pressure exerted by a mixture of gases equals the sum of the partial pressures of the gases in the mixture; the pressure of a gas in a mixture equals the pressure it would exert if it occupied the same volume alone at the same temperature