Answer:
The Grants wanted to find out whether they could see the force of natural selection at work, judging by which birds survived the changing environment. For the finches, body size and the size and shape of their beaks are traits that vary in adapting to environmental niches or changes in those niches.
The Grant's research demonstrated evolution in exchange in Galapagos finches.
This shows the existence of natural selection and proves Darwin's theory of evolution by natural selection.
Grant demonstrated that how very rapid changes in body and beak size in response to food supply and availability in Galapagos finches are driven by natural selection.
To know more about Darwin's theory of evolution :
https://brainly.com/question/4207376
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