Based on what scientists have observed about all living things on earth, what must be true of something found in space for it to be considered living? a. it must be able to move from place to place. b. it must be composed of one or more cells. c. it must have one or more organelles. d. it must contain a nucleus

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.