There is no proof that aliens exist. If they do, they may have eight arms.
Some alien races, if they exist, may have five arms.
From the data we have, we have not discovered any alien races.
It could be possible that some alien races could have four arms and six legs.
If aliens exist, some alien races could possibly have four arms and four horns.
Two pupils in the eye would be eerie,and perhaps some alien races have them.
Answer: no Answer: It isn't currently known whether there even are any alien creatures.
It isn't currently known whether ANY alien creatures even exist.
Yes. Some alien races have multiple arms. But currently, it is unknown.
In my opinion, yes. Some alien races have supernumerary body parts (i.e. multiple heads, arms, legs, fingers and toes, etc.). But currently, it is unknown.
No matter how often you ask, the only honest answer is that nobody has found ANY alien races so far, so nobody really knows anything about them for sure.
Yes. Some alien races have two hearts.
We have never encountered an alien race before, nor do we even know that they exist, so we don't know what alien physiologies may or may not be.