Charles Darwin studied the differences in the shape of the beaks of finches. He created sketches and took many notes on each species and its habitat. According to Darwin, the finches probably
One of 'Darwin's Finches' Struggles to Survive – National Geographic Education Blog
a
all had a common ancestor but adapted to their respective environments.
b
would die off eventually due to the introduction of a new species.
c
would become one species over time due to lack of natural resources.
d
all were genetically different and lived in very stable environments.