Darwin's finches are a group of about fifteen species of birds that inhabit the Galapagos Islands. The most important differences between species are in the size and shape of their beaks. Refer to the diagrams below to answer the following questions for 2 points each:

1. Explain how genetic mutations could cause the differences in beak size and length.

2. Explain how the different beaks could give different advantages to each bird.

3. Explain how the beak differences could relate to differences in the birds' niches.