In adults, red blood cells are made in one place, spend most of their lifespan in another, and most are finally destroyed in yet another place. which choice lists these locations in the correct chronological order?

In adults, red blood cells are produced in the bone marrow, spend most of their lifespan in blood vessels and most are finally destroyed in the organ called the spleen.

Red blood cells or the erythrocytes are the cellular components of the blood involved in the transport of gases, nutrients and wastes. The process of production of red blood cells from the bone marrow is called the erythropoiesis. It is produced by the red bone marrow of the large bones. After maturity they remain circulating in the blood vessels like arteries, veins and capillaries transporting substances. Finally spleen is the organ involved in the destruction of the old or damaged red blood cells in the body.

the real answer is b. scintillation counter

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.