Identical twins are not always so identical, because of epigenetic effects. As one article says, your genes do not have to be your destiny.
That means that just because they were conceived together, does not mean twins will die together. They can vary so much in their physical constitution, that one may die long before birth and the other one survive.
Here is a video trailer to a longer video all about identical twins and how they are formed.
And just because twins are conceived together does not mean they will die together. Sometimes they do, but there are plenty of identical twins alive today whose twin has died. The international twin-less twins group is there to help.
When a twin dies before birth, the sole survivor needs help and understanding. Womb twin survivors are the sole survivors of a twin or multiple pregnancy. This group, 1 in 10 of the population, includes survivors of a stillbirth, miscarriage, abortion and a "vanishing twin" pregnancy. It is a story of a twin bond broken by death, leaving a lonely survivor.
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