I believe B is the answer..
Answer:
Modern birds descended from a group of two-legged dinosaurs known as theropods, whose members include the towering Tyrannosaurus rex and the smaller velociraptors.
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Answer:
They had well dispersed armies, conquers already weak empires, and had some persecuted people convert to Islamic religion. ... Vigorous religious and political opposition. Rebel groups (AKA Abbasids) overthrow them in 750.
Explanation:
Answer:
education, governance, and free thought