What is the difference between the montgomery bus boycott and birmingham bombings

Which best describes the impact of the crusades on european exploration?

Which of the following best describes the outcome of the bay of pigs invasion? -it ended in a draw despite strong air support from the united states. -it was a partial success that to resolve the cuban missile crisis. -it was a success and created hostility between cuba and the soviet union. -it was a failure that was an embarrassment for the kennedy administration.

Why do many scientists suppose the land bridge theory of migration?