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]: Crossover occurs between non-sister chromatids of which chromosomes?
[A]: homologous

[Q]: During what in the small intestine do rings of smooth muscle repeatedly contract and then relax?
[A]:
segmentation