<span>Help???? Can some answer this</span>
The correct answer is A. Athletes
That is because of all the training and exercises they do every day so they have to have much energy to consume.
Superior vena cava- upper body inferior vena cava
lower body- bother drain into the right atrium
The tissue in higher plants that makes the vascular system, consisting of phloem and xylem, by which water and nutrients are conducted throughout the plant.