Final answer:
Fraternal twins come from separate eggs and sperm, while identical twins come from one fertilized egg that splits. Other multiple births can occur through different mechanisms.
Step-by-step explanation:
Fraternal twins are formed when two separate eggs are fertilized by two separate sperm. They have different genetic makeup and can be different genders. In contrast, identical twins are formed when one fertilized egg splits into two embryos. They have the same genetic makeup and are always the same gender.
Other multiple births can occur through various mechanisms. For example, triplets can be formed when three separate eggs are fertilized by three separate sperm. Additionally, multiples can also result from the splitting of one fertilized egg into three or more embryos, resulting in identical triplets or higher-order multiples.
Learn more about difference between fraternal and identical twins