Which of the following ecological concepts is illustrated by Darwin's Finches as shown below? 
Definitions:
Average Variable Costs
The total variable cost divided by the quantity of output produced, reflecting the variable cost per unit.
Sales Promotion
A marketing strategy involving the use of short-term incentives to encourage the purchase or sale of a product or service.
Marginal Revenue
The increase in revenue that results from selling one more unit of a product.
Imperfect Competition
A market structure characterized by the presence of several competing firms but which lack the conditions of perfect competition, often leading to market power.
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