Answer: Pretty sure oxygen i think not exactly sure but i think it is
Explanation:
Insulin, as I am a diabetic I know this for whatever reason
For an alternative the answer is Tylenol or Advil
Answer:
I think that Reliable website, such as CDC.gov could give you importaint information about what you need to know about anything in the government and what the government. But at the same time, it could also be bad because they could bias and you want a nonbias website so that you can get information not just from one side.
But another one could be hospitals because you could ask the workers that work there what they think about your questions and get a couple peoples answers to get enough research.
A) use your max heart rate, which is determined by subtracting age from 220
hope this helps :)