The recent study (1973) by the Grants in the Galapagos Islands documented a drought that dramatically changed the availability of food to the island's finches.
Finches with larger beaks tended to survive the drought over other finches with smaller beaks. This study illustrates __________.
A. mutation
B. organic change
C. random choice
D. natural selection
Question 2
A population of finches contains individuals with beaks that range from small to large. Finches with larger beaks can more easily break shells and extract food in times of stress.
If the environment becomes very dry and most plants (food) die, then there will be __________.
A. no change in the percentages of finches with large and small beaks
B. more finches with smaller beaks
C. an increase in all types of finches
D. more finches with larger beaks
The Grants and natural selection of beak size among the medium ground finch.
Galapagos Islands
Image of a blue whale's tail fluke with the Santa Barbara Channel Islands in the background, Au
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