Examlex
Which of the following is among the most mature soils on Earth?
Absorption
The process by which substances are taken up from the environment and enter the bloodstream or tissues.
Secretion
The process by which substances are produced and discharged from cells or glands for a particular function in the organism.
Epithelial
Pertaining to the epithelium, the layer of cells covering internal and external surfaces of the body, including skin, glands, and digestive tract lining.
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