When someone's core body temperature is dropping, what is oftentimes the most obvious indicator that they have transitioned from mild to moderate hypothermia.

auricle

explanation:

the flaps on the front of the atria are called the auricle.

answer:

i believe the answer is d).

explanation:

i think this is because you are tearing apart the muscle, and then when you eat, the muscle re-heals, making itself even stronger.

edit: i put b) before but i meant to put d). sorry for the incorrect answer.