Earlier quoted context omitted.
Yeah, but they also grew in same uterine environment.
They also probably grow up together, have similar diets, speak the same language... there are lots of correlated environmental factors with twins aside from their DNA. A better comparison would be separated twins (widely separated). But I'm not sure if anyone has looked at the relative differences between twins raised together vs apart.
> A better comparison would be separated twins (widely separated).
The two people in The Parent Trap are twins and were widely separated, yet they still looked identical, so much so that their parents could not even tell them apart.