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On the Galapagos Islands all the Finches beaks changed over the time of 2 years to adapt to the environment. If it wasn’t for those changes the Fiches would not have survived. Their beak got had changed so they could get the food they needed.

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The plants needed more water and they dried up, leaving food source scarce. Plant population decreases in December 1977 reduced Portulaca seeds 5 per m2 and Tribulus seeds 0 per m2
(cite: Lab 18 data sheet)

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The Finch population decreased immensely because the finches that didn’t have certain traits like, longer beaks, shorter beaks, meaning they weren’t able to get the proper nutrition, from lack of plants and other food sources. (Portulaca seeds 5 per m2 and Tribulus seeds 0 per m2 ) So, they didn’t survive.

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The medium ground finch population declined after the lack of food leaving 90 finches on the island out of  the 751. (cite: Lab 18 data sheet)

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The Medium Ground Finches could get to more food sources due to the changes in their beaks, due to this they could survive longer meaning more offspring. Their population increased after they adapted to the environment. (
1977 September 210
1977 November 186
1978 January 93
1978 March 189
1978 May 247
1978 June 306
)
(cite: Lab 18 data sheet)

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The Medium Ground Finches beak changed over time due to weather/food conditions. There was only 20 mm of rainfall over the course of the year on Daphne Major, the plants needed more water and they dried up, leaving food source scarce (cite: Lab 18 data sheet)

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The beak of the medium ground finch was evolved or changed through Natural Selection is the mechanism of microevolution that was present in the era 1976 to 1978.

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Peter and Rosemary