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The finches to be able to feed on the Portulaca seeds would need to increase their beak size. IF they had not changed their beak size it would limit their feeding options, with depending on the weather, and heat of that year could cause some of the food and finches to die off. They needed to change their beak so they could change their food to survive.

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- they would need to change their beak in times with low rainfall so they can drink and hold more water. If they hadn't changed their beak they most likely would not have survived.

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- they would need to adapt their beak through natural selection, this evidence here shows this. It shows that over a span of a few years, finches made their beaks longer. Why? Most likely so the can store more water or food for times needed.

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-the size of both the Portulaca and Tribulus plant can range from various sizes. The Portulaca plants seed can grow up to 3-9 inches long. The Tribulus seeds are about 5.8 mm. While the tribulus seeds are able for them to eat safely that is not all the finches can feed on.  (cite: lab 18 data set - seed type abundance)

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-On the island, there is a lot of rainfall and it rarely falls under 30mm of rain. In 1983, had the largest rainfall of 1359mm. There has been drought and times close to drought though, in 1988 there was 0 amount of rainfall, while in 1985 and 1989 there was inbetween only 3 - 5 mm of rainfall (cite: lab 18 data set- rainfall by year)

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-In november of 1976, the medium ground finches beak ran anywhere in between 5mm-14mm in depth and 6mm-15mm in length. While in 1978 the beak was 7mm-14mm in depth and 8mm-15mm in length (cite: lab 18 data set - finch characteristics 1976-1978)

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Natural Selection is the mechanism of microevolution that caused the beak of medium ground finch population in Daphne major to increase in size from 1976 to 1978