Plz help it's easy I'm just dum, take note if it is a false answer, I will report! Just simply look at the chart and figure what goes in the box this is the snork biology assignment it shows all the details in the picture. Scroll down for more context.

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.