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A(n) ____ is well supported (observationally and/or experimentally) system of rules and principles that can be applied to a wide variety of circumstances.
Kidneys
Bean-shaped organs that filter waste products from the blood, regulate fluid balance, and maintain electrolyte balance.
Bone Marrow
The soft, spongy tissue inside bones where blood cells are produced.
Stem Cells
Undifferentiated biological cells that can differentiate into specialized cells and can divide to produce more stem cells.
Blood Cells
Cells that circulate in the bloodstream, comprising red blood cells, white blood cells, and platelets.
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