Long ago, scientists did not know that cells existed because a) they did not have microscopes. b) they were too busy studying plants. c) they were not allowed to do research on animals. d) they were studying the sun and the planets instead.

Amain difference between state and federal courts is state courts try disputes between states, while federal courts try cases between citizens of a state. state courts try cases between citizens of a state, while federal courts try disputes between states. state courts consider the facts and law in making a decision, while federal courts consider the law, facts, and precedents. state courts consider the facts and precedents in a decision, while federal courts consider the law, facts, and precedents.