Answer :
The event that the scientist should begin her research with is a retreating glacier that exposes bare rock.
PRIMARY SUCCESSION:
Succession is generally a gradual change in the structure of a biological community or ecosystem. Succession can either be primary or secondary.
Primary succession is the type of succession that occurs on a bare surface without any previous record of life. For example; a bare rock.
According to this question, a scientist is working on primary succession. The ecological event that she should begin her research after is a retreating glacier that exposes bare rock.
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