Long Riddles and Answers

Question: in all of written history I won't show up at the end of a sentence but I will be there in the end . . .

Question: I am a big threat to humanity,
but you wouldn't get rid of me even if you could.

What am I?

Question: I have two rings. I move by request. If the mixture isn't right I just sit and rest.

What am I?

Question: John has 22 apples in a basket. Meghan and Dave both take 2 and you take 16 how many apples do you have?

Question: Your Parents Have Six Sons including you And Each Son Has One Sister. How Many People Are In The Family?