# data[].attributes.headline
Which mechanism of microevolution caused the beak of medium ground finch population in daphne major to increase in size from 1976 to 1978?  

# data[].attributes.subject
Which mechanism of microevolution caused the beak of medium ground finch population in daphne major to increase in size from 1976 to 1978?  

# data[].attributes.body
claim-  the mechanism of microevolution that caused the beak of medium ground finch  beaks to increase in size is Natural selection.

# data[].attributes.headline
With the lack of water there was the portulaca seeds end up dying.

# data[].attributes.subject
With the lack of water there was the portulaca seeds end up dying.

# data[].attributes.body
The portulaca plant was softer and easier for the birds with thin and short beaks to get through to eat the seeds.

# data[].attributes.headline
The portulaca and tribulus plant decreases in population 

# data[].attributes.subject
The portulaca and tribulus plant decreases in population 

# data[].attributes.body
the portulaca plant to 0 per m 2 and the tribulus plant to 5 per m 2 due to the drought in 1977.

# data[].attributes.headline
There was only 20 mm of water that rained that year.

# data[].attributes.subject
There was only 20 mm of water that rained that year.

# data[].attributes.headline
The birds with the thicker and longer becks survie 

# data[].attributes.subject
The birds with the thicker and longer becks survie 

# data[].attributes.body
dropped from 751 to 90 birds.

# data[].attributes.body
There was only 20 mm of water with this lack of water it killed off the portulaca plant, the birds food and along with it the birds with the smaller and thinner becks.
the birds with the  smaller and thinner beaks could not get through the tough outside of the tribulus plant.

# data[].attributes.body
The thicker and longer beck birds ended up surviving longer than the birds with the thinner and smaller becks, due to this reason the thicker and longer becks ended up reproducing and there generation ended up with thicker and longer becks.

# data[].attributes.body
natural selection- the process whereby organisms better adapted to their environment tend to survive and produce more offspring.

# data[].attributes.body
The birds were suffering from a lack of water and lack of food so the population ended up decreasing from 751 to 90 birds.