<span>In animals with a closed circulatory system, gas exchange occurs across the thin walls of the nerves and blood vessels that are equally distributed in the different parts of particular organisms. This is where RBCs carry oxygenated blood to supply the body with oxygen as well as the essential nutrients that are needed for different bodily functions and to maintain its homeostasis.</span>
I believe the answer is adaptation through evolution. Genetic diversity in populations such as bacteria, allow for new traits to be passed along during reproduction. For example, you use hand sanitizer on your hands. The hand sanitizer kills most of the germs, but a few survive and live to reproduce, passing on their immunity to certain chemicals found in the hand sanitizer. Hope this helps!
The correct answer is D. Sara suddenly became very ill; therefore, she went to see her doctor.
D thought the cranial nerves that attach to it the spinal cord is involved in sensory and motor inner action of the head and neck
