Correct answer choice is:
D. A and B only
A. Positive or negative, depending on circumstances
B. A body's automatic physical response
Explanation:
Stress is how a human body responds to any reasonable demand or threat. Once your brain senses the danger, whether it's real or imaginary that doesn't matter. As a result of the body's defense system, originated from the brain, kicks into gear in a speedy way, an automatic method referred to as "stress response."
3)Sorry I have no clue on this one
4)isotonic training
5)resting heart rate
Answer:
its variation in a variety of genes each exerting a small effect
Explanation:
