Answer:
control group
Explanation:
In this scenario, it can be said that Bob is in the control group of the experiment. In an experiment, the control group is the group that does not receive the variable that is being tested and instead receives a placebo that does not have any effect on the test subject, thus allowing the researchers to control the outcome of that group and compare it with the other groups. Which in this case the variable being tested is Ritalin.
He killed them!!!!!!!!!!!!!!!!
Answer:
River Valleys are productive farming areas because they provide fertile land by flooding.
Explanation:
Agriculture developed in river valleys as rivers flooded their banks, making lands around them fertile and provided fresh water for irrigation. Civilizations developed around rivers because their waters provided places to hunt and fish. Rivers brought along with fertile land along with minerals in it for crops to grow. Rivers allowed the early civilizations to engage in agriculture by growing crops like wheat, barley, and vegetables.
<span>president ,vice president ,Cabinet,and federal agencies are the answer.</span>