The answer is that <span>healthy </span>legs<span> have </span>veins<span> with smooth, elastic walls that </span>are<span> perfectly designed to </span>adapt<span> to the changes in pressure within a </span>vein<span>. </span>Veins<span> have </span>valves<span> that keep blood moving in one direction: back toward the heart. As the </span>leg<span> muscles </span>are<span> activated, the </span>venous valves<span> open to </span>allow<span> one-way flow in the direction of the heart.</span>
Answer:
anthropocentrism, philosophical viewpoint arguing that human beings are the central or most significant entities in the world. This is a basic belief embedded in many Western religions and philosophies.
Explanation:
ISIS stand for Islamic<span> State of </span>Iraq<span> and Syria, so Iraqi and Syria </span>
If states did not obey the central government, there would be the threat of that state wanting to secede from the union, which last time this happened in America, a Civil War broke out, which in turn cost the lives of over half a million Americans.