Diffusion is a process which does not require any energy. Why is this?
A. Because molecules move down an equilibrium slide.
B. Because molecules move down an active transport
tunnel.
C. Because molecules move down a concentration gradient.

C. Is the answer

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C. Because molecules move down a concentration gradient

Explanation:

Molecules move from a high concentration to a lower concentration

i'd say that the moon rock is about 2.2 billion years old.

c

explanation: