None, as both are usually biological parents.
None. They're just two ways of saying the same thing. :)
None of the Gosselin twins or sextuplets are identical, so it is easy to tell the Gosselin children apart.
there is none.
None
Hybrid powered is when a car and a monkey really like each other. A non hybrid powered car is one that runs on cocaine
None.
none
none
none
None
none
I don't think there is a difference.
none thing
None.
There is none.
None. They are the same