Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the independent variable?
O Type of fertilizer
O Type of sunflower
O Size of sunflower

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

maybe because its impossible for balloons to lift a whole entire house.