Part 3- Discussion You must answer this in a minimum of 8 complete sentences. What environmental pressures do you think may affect humans as Earth becomes more populated with humans in the future? Explain how these pressures may affect human traits.

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.

when it is at an intermediate population density

im not intirely sure but i think the anwser is d relative humidity