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the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an area of lower concentration, of a particular molecule, atom or ion, until dynamic equilibrium is achieved.
process by which cells become specialised to perform a specific function.
the membrane surrounding the vacuole. It is similar in structure and function to the cell...
a pattern of abnormalities found in babies born to mothers who drank excessive amounts of...
list of questions or statements that are used to classify or identify a living organism.
a ring of muscle that controls the passage of substances through a tube or body opening.