Which of these is a characteristic of sexual reproduction? a) it takes place in all cells of the body. b) it forms exact copies of the parent cell. c) it results in offspring with genetic variation. d) it requires only one parent to form a daughter cell. which one is right.

the answer would be knowledge about cars!

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.