You were driving through the great plains of nebraska to northern idaho. gradually, the grassland gave way to tall conifers. through which biomes did you travel?

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger

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.