Question

What can we learn about vertebrate evolution from tiktaalik that we did not know before?

Answer 1

Tiktaalik provides clues about a key transition in the history of life. Now extinct, this organism was a close relative of one our own ancestors — the first vertebrate to evolve four limbs and crawl out onto dry land. The evolutionary tree below shows the relationship between Tiktaalik, other fish, and four-legged vertebrates.