ha ha, It has not been proven yet so, as of right now no.
Well yeah. Its called a theory because it wasn't proven right yet. Once proven right, its called a fact.
An argument that has not been proven is a theory or a claim.
They have not yet been proven to exist. The most famous sightings have been proven hoaxes so far.
A theory
no they have not been or atleast i havent heard yet.
As of yet, it hasn't been proved either way.
The Yeti's existence has not yet been proven.
No, or at least it has not been proven so yet.
It is a proposition or a belief that has not yet been proven.
They argue points that have not yet been proven.
hasent been proven yet