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.
bt bb bz bz bs bs db h bj bg
Explanation:
hajans
False incubation is when there is no symptoms but ur sick
Answer: Matthias Schleiden
