Why is this the answer?

The answer is hands because this clever riddle uses fun word tricks to describe the very busy parts of your body that you use all day long. First, let's look at the beginning: "They are many and one". This is a great way to think about your two hands. You have two hands, which is like having 'many' of something. But each hand is one special group, a whole unit. And if you count all your fingers and thumbs, you have ten little helpers that are all part of that one hand. Your two hands work together, so they are like a team of many different parts that are still just one amazing pair. Next, the riddle says, "they wave and they drum". This clue is easy because it tells you exactly what your hands can do! You use your hands to wave goodbye and hello to your friends and family. When you are listening to music, you can also use your hands to drum out a fun beat on a table or on your legs to make a rhythm. Your hands are great at making motion and noise! The third clue is the trickiest one, so be a super-sleuth to solve it: "Used to cover a state". This is a very clever word puzzle. Think about covering things. Your hands can cover your eyes when you are in a state of feeling sleepy or sad, or they can cover a book to keep it safe. The word "state" can also be a hint about gloves or mittens, which cover your hands to keep them warm when you are in a cold state of weather. You also use your hands in school to point to or trace the outline of a state on a map, which is another way your hands "cover" that topic. Finally, the riddle says "they go with you everywhere". This is the perfect clue to finish the riddle! Unlike a toy or a game that you might leave at home, your hands are attached to your body and always travel with you, no matter where you go. They are your most helpful tools, always ready for action, drumming, waving, and helping you figure out even the trickiest riddles!