Short medium simple riddles for teens

What do you throw out when you want to use it, but take in when you don't want to use it?

What's the difference between here and there?

You see a boat filled with people. It has not sunk, but when you look again you don't see a single person on the boat. Why?

What is the similarity between a tooth and a tree?

What has a head like a cat, feet like a cat, a tail like a cat, but isn't a cat?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I create my lair with earthen string and dispatch my prey with a biting sting. What am I?

It is an insect, and the first part of its name is the name of another insect. What is it?

How many months have 28 days?

Brothers, all pair up; Bodies firm and tall. You only care to eat the solid food, And don’t care to eat the soup.