Given a scientific passage and an answer, generate a question for the given answer.

Passage: A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). Dependent variables change in response to the independent variable. Answer: independent variables
The values of which factors are controlled by the experimenter over the course of an experiment?

Passage: In many ways, humans are unique among mammals. For example, we have bigger brains and a greater ability to learn than any other species in the mammalian class. In many ways, however, we are typical of the mammalian order to which we belong. That order is the Primate Order. To fully understand what it means to be human, you need to know more about this fascinating order of mammals. Answer: humans
What mammalian class has the greatest ability to learn?

Passage: Earthquakes are used to identify plate boundaries ( Figure below ). When earthquake locations are put on a map, they outline the plates . The movements of the plates are called plate tectonics. Answer: plate tectonics
What is the movement of plates called?