OK so basically the location of the sinoatrial node will be in the right atrium
A. Avoidant because he avoids help from other people and denies into participating in a group work.
A. because even though it is not ideal to ever be stressed out to the point of it inflicting your heart. It is common for athletes do that to condition there hearth and lungs to function at the highest of extremes possible.
The answer is d is environmental <span />