What did Darwin observe about finches in the Galapagos Islands? (Choose ALL that are correct)

Question

Origin of the species: where did Darwin's finches come from? | Birds | The Guardian

a
Their beaks were adapted to match the foods they ate.
b
They were similar to the finches on the mainland.
c
They had identical phenotypes in all locations.
d
They had identical genotypes in all locations.
e
None of these were observations made by "Chuckie" Darwin

Answer 1

a. Their beaks were adapted to match the foods they ate.
b. They were similar to the finches on the mainland.