Yes you do.
the tarantula periodically shreds its skin
Actually it should look like this (cars, airplanes, trains, etc.). But if the sentence ends with an abbreviation, the single period will serve to end the sentence, as in cars, airplanes, trains, etc. You do not use double periods. You can, however, use a question mark or exclamation point after a period that ends a sentence. Were you talking about cars, airplanes, trains, etc.? If this looks unusual, it is because abbreviations, such as etc., are generally avoided at the ends of sentences.
You wouldn't use one is the acronym had a period in it. You could change the acronym so that it didn't have a period in it; such as ... "The doctor told him he had developed A.I.D.S." to "The doctor told him he had developed AIDS."
its a narow piece of land
Verbs don't come at the end of a complete sentence. If you have a command like -- Sit down! -- then this sentence consists of a verb only.
u use a period and a concluding last sentence
You can use a period (.), an exclamation mark (!), or a question mark (?) to end a sentence.
No.
the tarantula periodically shreds its skin
No, a period does not come after a question mark in a sentence. The use of a question mark indicates the end of an interrogative sentence, while a period is used to end a declarative sentence.
No, you do not need to place an additional period after an abbreviation if the abbreviation already includes a period at the end, like "etc.". Just use one period to end the sentence.
Use a period to end the final sentence within the parenthetical, then use a period outside of the parenthetical to close the sentence in which the parenthetical takes place.
You can use a period to create a clear and concise separation between independent clauses or to end a sentence. This can help to prevent run-on sentences and make the meaning of each sentence clearer for the reader.
What is the difference? You should use a period behind inc..
No, when using "OD" at the end of a sentence, you only need one period as the abbreviation already ends with a period. So it would be "O.D." with one period.
All sentences use punctuation, if only a period at the end.
no