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The drought made it very hard for the finch to survive but over time the amount of rainfall increased. This means that since the finch had to adapt to the enviroment due to the lack of rain. This caused many other factors such has food sources and rainfall decrease. Once the finch learned to adapt to the enviroment they started to survive more and increase in population.

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My reasoning to support evidence number 2 is that the Portulaca seed is soft and easy to eat, compared to the Tribulus seed that is hard and difficul to eat. This meaning the finch cannot eat tribulus seeds if they have a small and weak beak, which is giving them less of a chance to survive. The trait that aloowed the finch to survive was it having a long or deep beak. Other wise the finch had a harder time survivng which led to an increase in poplation.

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The medium ground finch grew a harder and stronger beak over the time span of 1976 to 1978. This means that the finch's population increased because they had the advantage of a better beak depth and length. Which means that their chances of survival are more likely. Since the finch had adapted a better beak over time the population increased because the finch's ability to survive was increased as well.