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.
I think it will be RNA for both questions
Answer:
Burning fossil fuels, over harvesting of petroleum.
Explanation:
If you cold attach the answers, I can give you a better answer.
Answer: the body plans of complex animals are very similar to one another