Diffusion Is the

Diffusion is the

A) random movement of the particles of a substance from a region of lower concentration to a region of higher concentration.
B) only means by which respiratory gases are exchanged between the respiratory medium (air or water) and the internal body fluids of an animal.
C) active movement of the particles of a substance to a region of higher concentration.
D) active movement of a substance to a region of lower concentration with help from a protein.
E) mechanism by which carbon dioxide moves from an area of low concentration to an area of higher concentration.

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