Given a scientific question, generate a correct answer to it.

[Q]: The female reproductive organs include the ovaries, fallopian tubes, uterus, and what?
[A]: vagina

[Q]: Normal blood is comprised of nearly half erythrocytes, which is another word for what cells?
[A]: red blood cells

[Q]: What is a rock exposed to if it's undergoing metamorphism?
[A]:
heat and pressure