The theories of continental drift and sea - floor spreading combined to make the theory of plate tectonics.
A. There is no objective reason to know which of the information sources is right. But because they make contradicting statements you utilize critical thinking to assess their value.
The answer in this question is TRUE. <span>Anti-semitism in russia in the late 1800s was a "push" factor that caused many people to leave their home country and migrate to the United States, this is true. It was a push factor, the anti-emitism in russia in the late 1800s, that cause many people to leave their home country and migrate to united states.</span>
