Question

question 2
1 point
when a substance cannot cross the plasma membrane by itself, and instead uses a protein carrier to move from high to low concentration, it uses _______.
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Explanation:

The problem is about the movement of substances across the plasma membrane. Facilitated diffusion is the process where substances move from high to low concentration (down the concentration gradient) with the help of a protein carrier, as they can't cross the membrane on their own.

Answer:

facilitated diffusion