09-06-2020
Biology

contestada

For diffusion to occur, which condition must be met?
A concentration gradient must exist.
A hypotonic external environment must exist.
A hypertonic external environment must exist.
Dynamic equilibrium must exist.

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09-06-2020

Answer:

A concentration gradient must exist.

Explanation:

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16-06-2020

Answer:

the answer is a

Explanation:

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