instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
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
answer:
What mammalian class has the greatest ability to learn?

question:
Passage: Red litmus paper turns blue when placed in a basic solution. Answer: blue
answer:
Red litmus paper turns what color when placed in a basic solution?

question:
Passage: An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. Answer: experiment
answer:
What is a controlled scientific study of specific variables called?