Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below. Beak size (mm)Frequency before selectionFrequency after selection10.010.00.000.000.000.0010.210.20.000.000.000.0010.410.40.020.020.000.0010.610.60.040.040.000.0010.810.80.080.080.000.0011.011.00.160.160.000.0011.211.20.200.200.000.0011.411.40.200.200.000.0011.611.60.160.160.020.0211.811.80.080.080.040.0412.012.00.040.040.080.0812.212.20.020.020.160.1612.412.40.000.000.200.2012.612.60.000.000.200.2012.812.80.000.000.160.1613.013.00.000.000.080.0813.213.20.000.000.040.0413.413.40.000.000.020.0213.613.60.000.000.000.0013.813.80.000.000.000.00 How much has the mean beak size changed due to selection? Give your answer to one decimal place. Units are mm. ### Natural Selection on Beak Size in Galapagos FinchesResearchers investigated the impact of natural selection on the beak sizes of medium ground finch hatchlings in the Galapagos Islands. Data were collected from two cohorts: one in 1976 just before a severe drought and another two years after the drought. Each cohort consisted of 100 finches. The drought resulted in a significant increase in the proportion of large, harder seeds available as food.#### Graph ExplanationThe bar graph above illustrates the frequency distribution of beak sizes before and after the drought.- **X-axis (Beak Size in mm):** Displays various beak sizes ranging from 10.0 mm to 13.8 mm.- **Y-axis (Frequency):** Represents the frequency of each beak size within the population.- **Light Blue Bars (Frequency before):** Shows the distribution of beak sizes before the drought. The most common beak sizes (with the highest frequencies) were between 10.8 mm and 11.6 mm.- **Orange Bars (Frequency after):** Shows the distribution of beak sizes after the drought. After the drought, larger beak sizes between 12.0 mm and 13.0 mm became more frequent, indicating a shift towards larger beaks.This shift suggests that natural selection favored finches with larger beaks, which were better suited to eat the larger seeds prevalent after the drought.

Here you have two tables. Table 1 describes values obtained from calculations, using frequency data…

Answered: Researchers measured the distribution…

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Researchers measured the distribution of beak sizes in a cohort of medium ground finch hatchlings in the Galapagos Islands in 1976 just before, and in a cohort of hatchlings two years after a severe drought. They measured 100 finches in each cohort. After the drought, the proportion of large, harder seeds was substantially greater than before the drought. Their data documenting this selective event are shown in graphical and tabular form below.

Beak size (mm)	Frequency before selection	Frequency after selection
10.010.0	0.000.00	0.000.00
10.210.2	0.000.00	0.000.00
10.410.4	0.020.02	0.000.00
10.610.6	0.040.04	0.000.00
10.810.8	0.080.08	0.000.00
11.011.0	0.160.16	0.000.00
11.211.2	0.200.20	0.000.00
11.411.4	0.200.20	0.000.00
11.611.6	0.160.16	0.020.02
11.811.8	0.080.08	0.040.04
12.012.0	0.040.04	0.080.08
12.212.2	0.020.02	0.160.16
12.412.4	0.000.00	0.200.20
12.612.6	0.000.00	0.200.20
12.812.8	0.000.00	0.160.16
13.013.0	0.000.00	0.080.08
13.213.2	0.000.00	0.040.04
13.413.4	0.000.00	0.020.02
13.613.6	0.000.00	0.000.00
13.813.8	0.000.00	0.000.00