Twins can be either monozygotic ("identical"), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ("fraternal"), meaning that they develop from two different eggs. In fraternal twins, each twin is fertilized by its
29/F/60kg/167cm - I dislike my belly, it makes me really self-conscious. (I have underwear on because of a small tattoo that could reveal my identity - sorry)