TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: The cardiovascular system moves nutrients and other substances throughout the body. Answer: cardiovascular system

SOLUTION: Which human body system system moves nutrients and other substances throughout the body?

PROBLEM: Passage: Sliding friction is friction that acts on objects when they are sliding over a surface. Sliding friction is weaker than static friction. That's why it's easier to slide a piece of furniture over the floor after you start it moving than it is to get it moving in the first place. Sliding friction can be useful. For example, you use sliding friction when you write with a pencil. The pencil "lead" slides easily over the paper, but there's just enough friction between the pencil and paper to leave a mark. Answer: sliding friction

SOLUTION: What type of friction is friction that acts on objects when they are sliding over a surface?

PROBLEM: Passage: Protection. The skeleton supports and protects the soft organs of the body. For example, the skull surrounds the brain to protect it from injury. The bones of the rib cage help protect the heart and lungs. Answer: skeleton

SOLUTION:
What supports and protects the soft organs of the body?