What event marks the end of both the paleozoic era and mesozoic era?
a. the ice ageb. the appearance of birds
c. a mass extinction of plants and animalsd. the breakup of a supercontinent

How did communism during the age of totalitarian control affect religion? a. citizens were permitted free practice of any religion. v. atheism became the official state policy. c. the government increased the number of russian orthodox churches in the country. d. catholicism became the official national religion