a. the long history of the black race.
It's an adjective; "The smallest puppy" is the subject of the sentence as the rest of the sentence describes it. Of course the subject cannot just be "puppy" so it must include "The smallest" as well. Since smallest is an adjective (A word that describes something else,) that answer is Adjective.
Assuming you meant explanatory text and not exclamation text, the answer would be brackets. For example, say your quotation is "She wrote the book." If you are quoting this directly in a paper, you want your audience to know who "she" is. So, you use brackets, and write the following: "[J.K. Rowling] wrote the book." Hope this helps.
The answer is letter c.
It can be both natural and human source of pollution. There are times when the intense heat can
trigger a brush fire and can expand depending on how strong the wind
blows. It can be caused by humans. it could due to carelessness of people leaving
flammable materials unchecked. Or using too much fuel that when lit would cause
a brush fire that would expand into a wildfires. The smoke from it pollutes the air.
