What natural element is one of the best preservers of prehistoric life?

What clues in fossils help scientists identify different ice ages?

Business and industries in the 1920's most closely followed the buying demands of a) the government b)farmers c)consumers d)manufactures

This passage says that the government is necessary because . the passage states that checks and balances are needed to

After nine states had ratified the constitution by mid-1788, other states quickly followed. all thirteen states had to obey it. it became law in the united states. none of the states had to obey it.