Id expand on this. I think the entire solar system has microbial life. Every crack it can exist it will. Asteroids, comets, the gas giants. Its likely all related too. Itd be mostly underground tho and hard to find. Probably multicellular life in some cases too like ice moons, and underground on mars in cave systems.
Well “intelligence” is a pretty vague term. Different people are good at different things. Intelligence isnt like a CPU clock or whatever where you can give it some general score. One person might be really good with language, and another is really good at math, or another is musically gifted, etc. How do you decide who is more “intelligent” between them? When theyre all amazing at different things? I know a guy who can barely put a sentence together, and struggles to understand what im saying sometimes, but he can take a car apart and put it back together again from memory.
Now as for if certain mental disabilities have a co-morbidity of trouble with speech im sure they do tho im no expert. Its very common for 1 condition to have a few other conditions that commonly accompany it. You can look up the specific diagnosis you have and check what the co-morbiditys are online.