Your body's internal feedback loops work by responding to??? A) information from the external environment

B) hormones from the pineal gland

C) changes in the internal environment

D) messages sent by the brain to body organs

Option C

Explanation:

the median of the data is 4.5.

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.