Because fusion centers are developed to support operations during an emergency that is either human-made, such as a terrorist event, or natural, such as a hurricane, flood, or tornado, their scope is considered to be:

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.

other information encoded in your genes might distinguish you from the others in the group