Respuesta :
It is A.Carrie Proteins.
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Answer: A. Carrier
Explanation: Proteins in the cell membrane that assist with facilitated diffusion are known as carrier proteins, or transport proteins, since they carry materials across the cell membrane.
Carrier proteins bind to a molecule on one side of the membrane, change shapes to shield the molecule from the lipid bilayer, and then release the molecule on the other side of the membrane.