Independent variable I believe is the correct answer. Since that is what is being changed.
Blood is under the greatest pressure in the Heart.
Answer:what we can do for a better health population is to make sure children are vaccinated against all major and minor deseases. We also need to enforce better handwashing, cover up when coughing, and sneezing. We need to have better sanitation policies.
Explanation:
B. Avoid friendships with those who do things you know are wrong
I would think all of the above but honestly, they would first have to WANT to stop themselves and not be pushed by other people like on Intervention where you see that they go back to drugs or alcohol, it's because they were pushed and didn't do it when they were ready, sometimes, that time comes too late or not at all.