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process by which cells become specialised to perform a specific function.
the outer region of the kidney, grainy in appearance, in which the Bowman's capsules of the...
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
an individual who donates an organ for the purpose of transplanting it into another person in an...
the introduction of harmful substances (pollutants) into the environment.