Pulse wave velocity (PWV) is a measure of arterial stiffness.he study of the basic scientific principles of the velocity of the pulse wave through the arterial tree dates back to 1808 with the work of Thomas Young.
Put simply, chain migration is a derogatory term used to describe the ability of U.S. citizens and green card holders to bring their extended family into the country. A majority of the roughly one million foreigners who are allowed to enter the U.S. to become permanent residents each year are approved because they're related to Americans.
The movement of people from one place to another.    Migration is a cyclic behavior that involves the regular, seasonal  or annual journey of an animal from one place â¦ to another and back  again.Animals usually migrate to an area that provides a lot of  food or a good environment for reproduction.Answer Migration is  regular movement over relatively long distances. Migratory animals  generally make one round trip between two regions each year,  although there is considerable variation among species. stingray is a type of fish, so it can swim, eat other sealife (from plankton to fish to other rays, depending on its size), raise offspring, and sting a person if stepped on â¦ .