B. Science can answer only questions about the natural world.
Explanation:
Substances diffuse naturally from an area of higher to lower concentration.
Via diffusion, small molecules can move from regions of high concentration to regions of low concentration until an equilibrium- a stable balance of solute: solvent, is reached. This occurs along the concentration gradient of the molecule, and usually involves small non-polar molecules in cells such as oxygen and carbon dioxide. In cellular transport, diffusion is also referred to as passive transport.
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The answer is 3 heat and or presssure is applied
