Answer:
health is most important. Scince is composition on physics,chemistry ,biology astronomy and other subjects. only boilogy represents health. But only biology isnot inlisted so that the health education is an applied science ratger than a pure science.
Clean living environment. Only fortune and opportunities can determine that, while you yourself can control the other two.
Human behavior which can be seen by other people and observed by other people is usually also the behavior which is often subject to measurement, control, and experimentation in psychological experiments. The field which does this is psychology.
