triplets happen when 1 agg splits into 3 and triplets form, they either look the same or not the same but they have tha same blood group.
developmental variation
the tendency among similar organism to differ from each other to some degree..
Yes, but it is highly unlikely without in-vitro fertilization, no matter what the family history is.
Quite high, but it depends. If it naturally occured then the chance is a lot higher than if you are a triplet due to fertility treatments
retain some elements of the theme