What environmental factor drives finch beak evolution?

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Multiple Choice

What environmental factor drives finch beak evolution?

Explanation:
Environmental conditions shaped by weather drive how available food resources are, which in turn selects for beak traits that improve feeding. In finches, changes in weather alter which seeds are abundant and how hard they are to crack. A drought or other weather shift can reduce soft seeds and favor birds with larger, stronger beaks that can crack tougher seeds, so those individuals leave more offspring. Over generations, the population’s average beak size shifts in response to this resource landscape. Weather is the environmental factor at play because it changes the feeding environment; predator pressure, migration, and genetic drift don’t consistently create this directional, resource-driven change in beak morphology.

Environmental conditions shaped by weather drive how available food resources are, which in turn selects for beak traits that improve feeding. In finches, changes in weather alter which seeds are abundant and how hard they are to crack. A drought or other weather shift can reduce soft seeds and favor birds with larger, stronger beaks that can crack tougher seeds, so those individuals leave more offspring. Over generations, the population’s average beak size shifts in response to this resource landscape. Weather is the environmental factor at play because it changes the feeding environment; predator pressure, migration, and genetic drift don’t consistently create this directional, resource-driven change in beak morphology.

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