What is the maim reason human relations skills may improve your grade?

It may be because you have the aspect of collaboration. So your brain is open to more ideas and it makes it easier to have beter ideas. 

Whats important is to eat healthy food to prevent heart disease. another why not to get heart disease is to always exercise in a timely manner. lastly, always stay active and go to the doctor for checkups just in case.

Answer. av valves opens;