There are a number of situations which would be inappropriate to use a comma in. The common ones include when breaking a sentence and when stating number of items among others.
It would be appropriate to use a comma between compound subjects or compound verbs.
No. After the word and comma can not be used, as it is grammatically inappropriate to use comma after conjunctions such as and, which are called coordinate conjunctions.
what appropraite and inappropriate ways of communcations
There is not a single rule, because whether you use a comma with "because" and where you would use it depend on how you are using "because". The first sentence is an example of a common situation, in which "because" introduces a dependent clause. In this situation, you use a comma before "because". In some situations, you don't need any commas: The game was delayed because of rain. Because his interview was the best of the lot, he was our first choice to fill the position. In other situations, you would put a comma both before and after "because": I have to cancel our lunch, because, as it turns out, I will be in Helsinki.
In many, but not all, situations, the comma goes before the word "or": The banquet offered a choice of steak, chicken, or salmon. Get out of there right now, or I'll tell the teacher. In some situations, however, it is correct to have a comma after "or": I am not a big fan of baseball or, to be perfectly honest, most sports.
I would expect a comma to be used, unfortunately, this is not always the case!
You would use a comma before it. Xerox, Inc.
The comma would come after it.
In general, no, but there are some situations in which using a comma after "but" is correct. If the word "but" is followed by an expression that needs to be set off by commas, then you would put a comma after "but" and another comma after the expression. Here is an example: I was going to say no, but, because you have presented such a persuasive argument, I have decided to allow it. An example of a more typical sentence using "but", where there is a comma before but not after "but", is the first sentence in this answer.
I would not use a comma in the phrase varied native fauna.
Perhaps the most frequent misuse of the comma is the placing of a comma between two independent clauses without a coördinating conjunction. "The sun rose, therefore, light began flooding my bedroom," for example, is a comma splice (a type of run-on sentence) because a comma cannot join the two independent clauses. To fix the problem, the first comma in that sentence could be changed to a semicolon, or the first comma could be changed to a period and the t in thereforecapitalized.
If it is a business letter, don't use the th; use the comma and year. That way it is absolutely clear.