Answer:
Health.
Explanation:
From working out, you can understand what kind of things benefit your and other peoples health.
Life is the seemingly endless cycle of the repetitious processes of the mind altering psychoactive dispositions of intricate and faulty human responses to stimuli.
An A1C, or Glycated hemoglobin test is taken. This test tells you average blood sugar level from the past few months.
Answer:
the answer is that HIV causes AIDS
I think that drugs and their affects would be interesting to learn about, because its a big issue in our world today, and it's good to learn about these things (such as drugs/alcohol)