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Mutation is when an organism goes through a change in DNA. If the mutation is beneficial the animal will pass it down. This relates to Darwin's finches because finches were similar at once but when the finches were at Galapagos they went through a beneficial mutation which changed the finches beaks and let the finch adapt to the island.

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This map shows the beginning of Darwin's 5 year journey on his ship the Beagle. Darwin went around the world and this was the journey that he made his discoveries.

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On Darwin's return route across the pacific he arrived at the Galapagos island. Darwin found several species of finches  that varied. This helped Darwin discover his theory.

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In the Galapagos island Darwin found finches that were similar from other islands but there beaks were different in size and shape. Darwin found out that the size and shape of the beak are adapted to different food sources on that island.

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After Darwin's long voyage Darwin made a theory called Natural Selection. Natural Selection is where organisms better adapt to their environment to survive an reproduce.