# data[].attributes.body
What mechanism of microevolution caused the average beak size of the medium ground finch on Daphne Major to increase?

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The average amount of portulaca seeds, a small soft seed, greatly decreased even reaching zero at some points. While the larger harder tribulus seed only decreased to a low of four
Finch Data Spreadsheet

# data[].attributes.body
As the amount of seeds decreased the finches that weren't adapted died, causing a huge decrease in population. The birds that survived were mostly big beaked, this is why the average beak size increased. This shows natural selection because the birds that were adapted to eat the available food survived.

# data[].attributes.body
Because the Portulaca seed decreased so greatly; most of the thin beaked finches that ate them starved. However, the large beaked finches could eat the tribulus seeds so they didn't starve. This is why most of the birds left were big beaked. This shows natural selection because the better adapted birds survived because they could eat the available food.

# data[].attributes.body
This caused a massive decrease to plant life, which in turn caused a massive decrease to availability of food. The finches that could not eat the available food died, leaving only the fit left. This shows natural selection because the finches that were not adapted died, but the ones that were survived

# data[].attributes.body
In 1976 there were 751 finches and in 1978 there were 93 of those remaining. and the average beak size went form 9.6 mm depth and 10.7 mm length in 1976, to 10.5 mm depth and 11.6 mm length in 1978
Finch Data Spreadsheet

# data[].attributes.body
in 1976 which caused the rain fall to go from 422 mm in 1975, to 20 mm in 1977
Finch Data Spreadsheet

# data[].attributes.body
Natural selection is the mechanism of microevolution that caused the average beak size of the medium ground finch on Daphne Major to increase