Question

fill in the blank: ____________ are any barriers that completely halt the diffusion.

Explanation:

Reflecting barriers are barriers that completely halt the diffusion. When diffusion occurs, reflecting barriers do not allow the diffusing substance or entity to pass through them, effectively stopping the process. Permeable barriers allow some diffusion, absorbing barriers take in the diffusing substance, and semi - permeable barriers have selective permeability.

Answer:

Reflecting barriers