Why do women have 2 fallopian tubes?
because you have two ovaries backup system if one fails you have a spare .... men have two testies for same reason if one fails or is lost ....!!
The two tubes compliment each other. However the greatest importance of the presence of the pair of tubes is when two or more embryos are developed all at once after fertilization of the egg, leading to development of twins or triplets.
Well I think it's because you have to ovaries that carry the matured eggs. But why do you have 2 legs? 2 eyes? 2 arms? Etc