How is the Grants' work similar to Darwins?​

The Grants study the evolution of Darwin's finches on the Galapagos Islands. The birds have been named for Darwin, in part, because he later theorized that the 13 distinct species were all descendants of a common ancestor. ... (The only other finch on the island is the cactus finch.)

Explanation:

"a.) well–developed vascular system."

i think its through the fallopian tube