The correct answer will stress the differences between the observational study and experimental study - and options a), c) and d) can be true of both.
The correct answer is:
b. Experimental subjects are left free of manipulation
-this is the major difference between the observation and experiment.
The main industry for food was rice
If you are talking about the American Civil War, then yes! This mad the war very had to fight, since families with different opinions on the American way of life were pitted against each other in America's bloodiest war.
Answer:
The spark of nationalism in germany and Italy gave their expansionist idea, as they believe they are superior as one race, its nationalism boost the confidence of the nation to wage war with other nations.
