A researcher is observing human muscle cells through an electron microscope. They notice that cells from a more physically active individual
contain more of a certain organelle than those of a less active individual.
Which organelle are they observing?

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.

im not intirely sure but i think the anwser is d relative humidity

idk and i also need to know where are those bio brainy acts lol