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

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.

What can we learn about vertebrate evolution from Tiktaalik that we did not know before? The variation in shape and function of the forelimb in tetrapods is a result of. The forelimb of a chicken and a primate contain many of the same bones arranged in the same order.

Explanation:

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )