Select the products of the preparatory reaction and the Krebs cycle after two turns. Select all that apply.

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.

bacterium is not correct

i got you i did it ya know what it is just needing to fill this in for a quick task!