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Host : a food source Decrease in atmospheric pressure : associated with stormy weather and precipitation Barometer : an instrument that measures atmospheric pressure Anemometer : measures the speed of wind or gas current Hygrometer : measures humidity of air or gas Independent Variable : quantity that is known, plotted along the X-axis 2 | P a g e Dependent Variable : quantity that is unknown, plotted along the Y-axis Recessive : little t, an allele that is masked when a dominant allele is present Dominant : big T, describes a trait that covers over, or dominates, another form of that trait. Commenalism : a symbiotic relationship where one organism benefits and the other neither is harmed nor benefited Mutualism : a relationship between two species in which both species benefit Parasitism : a relationship between two organisms of different species where one benefits and the other is harmed Osmosis 3 | P a g e : diffusion of water across a selectively permeable membrane, how water enters a plant Nimbostratus clouds : gray rain clou