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Passive diffusion is a form of passive transport and a type of diffusion by which particles from a high concentration gradient passes through a biological membrane to a low concentration gradient. Diffusion, or simple diffusion on the other hand, is the passage of molecules without the need of a membrane.
Answer:
It is B, data.
Explanation:
Data is what you collect from an experiment.
A desert would be a good example because there is no exact source of water there unless you are in a specific one.