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: Breeding in birds occurs through an internal type of what process? Answer: fertilization
[EX A]: Breeding in birds is through internal fertilization, where the egg is fertilized inside the female.

[EX Q]: Question: The term "vapor" refers to the gas phase when it exists at a temperature below what? Answer: boiling temperature
[EX A]: for low temperatures, where the phase can change from a gas to a liquid. The term "vapor" refers to the gas phase when it exists at a temperature below the boiling temperature.

[EX Q]: Question: What organs filter blood and form urine? Answer: the kidneys
[EX A]:
The kidneys filter blood and form urine. They are part of the urinary system, which also includes the ureters, bladder, and urethra.