Why is sti considered a scientifically controversial strategy?

This discovery was controversial to a small degree because it challenged a widely accepted belief that Pluto was a planet. However, Pluto was discovered less than a century ago, and people showed little resistance to accepting the change.

Explanation:

Answer for Plato

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.