Best short easy riddles

Before Mt. Everest was discovered, what was the highest mountain in the world?

You bury me when I am alive, and dig me up when I die. What am I?

What is invisible and makes people suffer from symptoms like sweating and nausea, yet people can’t survive without it?

When it comes to me, you go on red and stops on green. What am I?

The more it dries, the wetter it gets. What is it?

What has a tongue, cannot walk, but gets around a lot?

What has many keys but can't open any doors?

You are in a room with 3 monkeys. One monkey has a banana, one has a stick, and one has nothing. Who is the smartest primate?

There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?

The more you take, the more you leave behind. What am I?