That would depend on the meaning of 'undisturbed'.
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the most undisturbed environment is between the border of Alaska
and Canada
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No, "undisturbed" does not have a prefix. The word "undisturbed" is formed by combining the prefix "un-" with the root word "disturbed."
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It can be (the crime scene was left undisturbed). It is the
negative of "disturbed" which is the past tense and past participle
of the verb (to disturb). Undisturbed may be a verb form,
participial, or adjective.
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the way geologist know that rock layers are undisturbed is the
rock layers are folded