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a biological membrane that separates the interior of all cells from the outside environment.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
the process whereby the products of digestion are transported from the digestive tract into the...
process by which cells become specialised to perform a specific function.
a disease caused when the body's immune system destroys other body cells.
list of questions or statements that are used to classify or identify a living organism.