Explain how scientific knowledge is developed when people make observations about the natural world

Did the both the us and ussr have atomic weapons after 1949

Plz ! the election marked the last time the federalist party ran a candidate for president. a. 1812. b. 1820. c. 1816. d. 1824.

What happened when spain’s government could not overcome social and economic problems during the great depression? citizen groups revolted against the government. the head of the government gave his resignation. a new leader seized control from the military rulers. the army led a rebellion against the government.