instruction:
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.
question:
Question: What do sharks use to secrete salt to assist in osmoregulation? Answer: rectal gland
answer:
animals exposed to similar levels of urea. Sharks are cartilaginous fish with a rectal gland to secrete salt and assist in osmoregulation.

question:
Question: Giardia is an example of a protozoa that uses flagella for what purpose? Answer: movement
answer:
type of protozoa, such as Giardia, that moves with flagella.

question:
Question: What kind of health problem can occur in the kidney and potentially cause problems with urination? Answer: kidney stones
answer:
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.