if a substance has a half-life of 10 million years, what fraction of the atoms
remain after 20 million years?

What are mountains that divide european russia from asian russia?

Select the best hypothesis explaining why countries may have preferred communism. communism promised jobs after the insecurities of war. communists forced the people to do what they said. communism was fueled by a dislike for democracy. communism provided economic freedom for businesses and workers.

Briefly describe in your own words the pros and cons of the changes people have made to the land in south florida.