If ferns need warm weather to grow, ferns in the warmer areas will grow faster. What is the student doing?

A drawing a conclusion
B making a prediction
C conducting an experiment
D forming a hypothesis

a physical change is being made.

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.