I will try to give you the best answer by completing your statement.
During a marathon, approximately 99% of your muscles needs are met by the OES or Oxygen Energy System. Energy systems are the ones encharge of distributing the energy you need for a certain act.
True, we can cure things that we couldn't before. Even things like the common cold used to be deadly.
Sex can have negative health consequences. Negative outcomes include, unwanted pregnancy, sexually transmitted infections, internal injury etc.
AIDS. It’s when hiv progresses and destroys your immune system a lot. So the answer is A. I hope this helps!