Incorrect. It's not a valid answer to make a statement as if scientific and then to come back with "We don't know." If you don't know, then don't make the statement in the first place.
"That's not a valid answer."
Of course it is a valid answer. We do not know is always a valid answer. We may know at some point, but we do not know at this point.
Incorrect. It's not a valid answer to make a statement as if scientific and then to come back with "We don't know." If you don't know, then don't make the statement in the first place.