Charles Darwin was never a
student, but a what?

Naturalist

Explanation:

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some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.