After two half-lives, how much of the original material has decayed? 25 percent
50 percent
75 percent
100 percent

What were the 2 main elements as a result of the treaty?

Which terms describe the countries with which the united states and soviet union attempted to ally during the proxy wars? check all that apply. unstable newly industrialized colonial newly independent developing militaristic resource rich

In sparta, boys entered military training at age 14. true or false