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Subject:

the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an...

the movement of particles from an area of higher concentration to an area of lower concentration...

Subject:

the difference between the concentrations of a specific molecule in two adjacent areas.

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the breaking down of large, complex food particles into smaller, soluble molecules which can be...

Subject:

the body system concerned with the digestion and absorption of nutrients.

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