Molecules tend to move from an area where theybare more concentrated to an area where they are less conventrated. This process is called?

The process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated is called Diffusion :)

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a

explanation:

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: