In broad terms, finches. In specific terms, he observed how over time, the beak sizes and shapes of said finches changed to adapt to the food sources available.
I hope I was able to help. Best of luck.
Answer:
to prevent the virus to have a big effect on the body of humans so the cells can fight against it
She compares the data with other outcomes of the same experiment and conducts the experiment more than one time without changing anything
