An example of communication between cells of human body systems is the "fight, flight or freeze" response. The physiological responses enable
the body to deal with extraordinary situations. Use the chart on the left
to determine which two systems would work together in a night
response such as almost jumping out of the way of a car. What two systems are being used?

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.

high growth (apex)