If an attractive and intelligent boy is elected to the student council in high school, is his success due to heredity or to environment?

answer: environment

Explanation:

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.