Yes.
Yes, spelling and grammar do matter for proper communication.
Not necessarily, but smarter people usually are better at spelling, and spelling poorly makes the author seem unintelligent, no matter what the subject matter.
That is the correct US spelling of "gray matter" (brain tissue). The predominant UK and Canadian spelling of the color is "grey."
Do you mean Register? Registier, no matter what the spelling, is not a word.
Spelling is a matter of mechanics, as it relates to the correct arrangement of letters to form words. Punctuation and capitalization are more related to grammar and style.
Its not the same.. a different spelling does matter..
The correct spelling is "feces." It refers to waste matter discharged from the bowels. If you meant the spelling of "faces," that is spelled "faces."
Yes, boasting has an a in it, no matter who is doing the boasting about whom.
The spelling is pus, which consists of dead cellular matter.
The correct spelling of 'pysics' is physics. Physics is greek for knowledge of nature and is a part of natural science that involves the study of matter and its motion.
If the spelling does not matter, root, loot, boot, suit
That is the correct spelling of "toilet" (a sanitary plumbing fixture, or grooming).