Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: What kind of health problem can occur in the kidney and potentially cause problems with urination? Answer: kidney stones
[EX A]: Kidney stones are mineral crystals that form in urine inside the kidney. They may be extremely painful. If they block a ureter, they must be removed so urine can leave the kidney and be excreted.

[EX Q]: Question: While most mammals give birth to live young, monotremes can do what? Answer: lay eggs
[EX A]: Monotremes can lay eggs, but most mammals give birth to live young.

[EX Q]: Question: Bones, cartilage, and ligaments make up what anatomical system? Answer: skeletal system
[EX A]:
The skeletal system is made up of bones, cartilage, and ligaments. The skeletal system has many important functions in your body. What bones protect the heart and lungs? What protects the brain?.