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Graph 3 - in this graph we can see the beak depth and lengths from the years 1976 -1978 grew because the small birds died out and we not able to survive due to the small seeds disappearing. The bird that have the big beaks survived and thrived because they were able to eat the hard shells. this caused natural selection.

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Graph 2 - shows the amounts of food and how much is left on the island. the small soft seed (portulaca) the small birds ate have stopped growing during the drought, The big hard plant (tribulus) grew more during this.

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Graph 1 - we can tell that the island is in a drought, which caused the portulaca to stop growing (the food for the small birds) so the small birds died out

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The beak sizes of the finches in creased from 9.6mm in depth and 10.7mm in length on the year 1976 and on the year 1978 the sizes of the beaks changed, depth- 10.5mm and length- 11.6

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There was a major drought between the years 1976 - 1978

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in 1976 the portulaca and the tribulus waere at about the same in population. when the drought hit the food levels went to zero for the portulaca, the tribulus the big food just lost a little of its population

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NATURAL SELECTION CAUSED THE BEAKS OF THE MEDIUM GROUND FINCH POPULATION TO INCREASE IN SIZE FROM 1976 -1978 

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NATURAL SELECTION CAUSED THE BEAKS OF THE MEDIUM GROUND FINCH POPULATION TO INCREASE IN SIZE FROM 1976 -1978 

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in 1976 it rained 130 mm of rain that year, and the next year it rained 20mm for the whole year, the year after that the rainfall increased from 20 mm to 50mm of rain