Why is this the answer?

The answer is bell because this clever riddle uses fun word pictures to describe something you can hear all over the world, but it is not alive like you or me. Let us look closely at the first clue: "You heart it speak". This means you do not need to see the bell to know it is there. Bells make a wonderful, loud sound that travels far. You can hear church bells ringing out across a town, or a tiny handbell being shaken for attention. Because they make such a clear, beautiful noise, the riddle says you "hear it speak" even though a bell cannot truly talk like a person. Now let us think about the second part: "for it has a hard tongue". A person's tongue is soft and helps us with talking and eating. But the tongue of a bell is something quite different. Inside almost every bell is a special piece of metal that swings or moves. This piece is called a clapper. When the bell is moved, the hard clapper hits the hard, round sides of the bell to make that clear ringing sound. Since this hard part does the work of making the sound, the riddle cleverly calls it a "hard tongue." It is a smart way to describe a tool's parts by comparing them to our own bodies. Finally, the last two clues tell us what the bell is not: "But it cannot breathe, for it has not a lung." Only living creatures need lungs to take big breaths of air. A bell is an object made of metal, like the one that rings at the end of recess or the little one on a bicycle. Because it is an object and not a person or animal, it does not need to breathe or have lungs. This riddle is a great puzzle because it makes you think about an everyday item in a completely new way, using the trick of comparing a simple object to a living creature. It can "speak" with its hard tongue, but it will never need to stop for a breath.