You only capitalize 'deceased' if it is at the start of a sentence.
Generally speaking it is not necessary to capitalize decades unless it occurs at the start of a sentence.
When the word is at the start of a sentence.
You only capitalize the 'p' in 'provincial if it is at the start of a sentence or part of a name/title.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
No, only at the start of the sentence.
No, you don't have to capitalize the "m" in "marsupial" unless it is the start of a sentence, or maybe used as a heading in a table.
You capitalize the word 'union' when it is at the start of a sentence or part of a title/name (Eg: Singapore Teachers' Union).
No.
No, unless it is at the start of an sentence (In this case you capitalize only 'summer') or part of a title/name (Eg. Google Summer Internship).
You would capitalize the next word after a comma if it is the start of a new sentence or if it is a proper noun.
I would not capitalize it because it is a just a noun. Think, would you capitalize house. As in, they live in a green House. What about they live in a blue Teepee? My advice: don't capitalize.