I think the answer is D. A good indicator is the resting heart rate. Exercise strengthen your heart and it makes it more efficient. The resting heart rate shows of the heart is pumping blood normally each time it contracts. Having a normal resting heart rate would mean a healthy heart.
It has been linked to lung cancer.
hope this helps!
Answer:
d
Explanation:
many of them become certified
Answer:
Chemical bonds are temporary connections between molecules that hold two or more molecules together. Types of chemical bonds including covalent, ionic, and hydrogen bonds. Chemical bonds enable chemical compounds to be formed. Chemical bonds are essential to all life.
