Twins are two offspring produced by the same pregnancy. They can be either identical twins, meaning that they develop from one egg (monozygote), which splits and forms two embryos, or fraternal twins, meaning that they develop from two different eggs (dizygote). In fraternal twins, each twin is fertilized by its own sperm cell.

Stock photo: Twins are two offspring produced by the same pregnancy. They can be either identical twins, meaning that they develop from one egg (monozygote), which splits and forms two embryos, or fraternal twins, meaning that they develop from two different eggs (dizygote). In fraternal twins, each twin is fertilized by its own sperm cell. was taken by foapper55988 .