The new idea however, became herbivores were not just controlled from the bottom, but they also had to be controlled from the top down by predators. This new idea was called what

it sounds like the question is talking about Top-down control but i dk if that's the answer because it's in the question

plant because they survive by water, sunlight, ex.

explanation:

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.