external links principle[ edit ] when a chemical comes in contact with the mucous membrane beneath the tongue, it is absorbed. because the connective tissue beneath the epithelium contains a profusion of capillaries, the substance then diffuses into them and enters the venous circulation. in contrast, substances...
(comets may also have brought amino acids, the building blocks of biogenetic activity, to earth.) eventually, water became one of the most important substances on earth—but for civilizations to advance, it needed to be controlled. his process began about ten thousand years ago with the development of...
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