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an individual who donates an organ for the purpose of transplanting it into another person in an attempt to save their life.
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
the condition in which a persons' normal capacity to think or act is affected due to the...
the protection of species, habitats and ecosystems and the management of natural resources.
a molecule that stores large amounts of energy that can be used for metabolic activity.
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.