Researchers used an experimental design in which they cleared large patches of pine forest in five areas. The central cleared area served as the source of dispersers. The four remaining cleared patches were (1) a rectangular unconnected patch, (2) a rectangular patch connected to the central patch by a cleared path that served as a corridor, and (3) two rectangular patches with wings (patches with corridors that did not connect to other patches). The researchers were interested in the importance of habitat corridors to the movement of seeds, pollen, and butterflies between central and peripheral habitat patches. What was the purpose of the unconnected winged patches? 
Definitions:
Net Sales
The total sales income of a company after removing costs associated with returns, allowances for damaged or lost items, and price reductions.
Multiple-Step Income Statement
A detailed financial statement that separates operating revenue and expenses from non-operating items, displaying multiple layers of income and expense.
Net Sales
The revenue from sales after deducting returns, allowances for damaged or missing goods, and discounts.
Merchandise Inventory
Goods that a retail or wholesale company intends to sell to customers, recorded as a current asset on the balance sheet.
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