A nocturnal animal waking up when the sun goes down is an example of which characteristic of living thing?
A. Respond to stimuli
B. Are made of cells
C. Grow and develop
D. Obtain and use resources for energy

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.