Question

Charles Darwin observed a unique beak size

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and shape in the finch population of each of the Galapagos Islands
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Which is the most likely cause of the observed variation?

Answer 1

The finches variations in the founders finches beaks allowed them adapted to the different niche in their environment. Natural selection allowed those with long, pointy beaks to be able to utilize them to feed on insects. Those with shorter, more powerful beaks were able to feed off of nuts. Over time, the selection forces allowed these traits to become predominant in small groups eventually resulting in speciation. Also, behavioral changes (sleep/wake cycles, nesting patterns, the island the lived on, etc.) contributed to the various species of finches.

Answer 2

The Islands had different biomes

Step-by-step explanation:

They had began to adapt to their surroundings.