Answer:
What is it that given one, you’ll have either two or none?
What doesn't get any wetter, no matter how much rain falls on it?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
It's like food but water kills it. What is it?
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
Lynn likes grapes but not potatoes. She likes squash but not lettuce, and she likes peas but not onions. Following the same rule, will she like pumpkins or apples?