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Answer :
The Grants visited Daphne Major once more in 1978 to observe how the drought affected the medium ground finches' progeny. They measured the offspring and contrasted the size of their beaks to that of the preceding generations (before the drought).
The Grants discovered that the young of the birds that endured the drought of 1977 tended to be larger, and have larger beaks. As a result of this adaptation to a new habitat, the population of larger-beaked finches increased in the succeeding generation.
For their outstanding long-term studies showing evolution in action in Galápagos finches, Peter and Rosemary Grant are renowned. They have shown that natural selection is responsible for the incredibly quick changes in body and beak size in response to variations in the availability of food.
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