Why is this the answer?

The answer is water because this very clever riddle tells the amazing life story of the water that is all around us, and even inside of us, making it a wonderful world explorer. Water is one of the most important things on our whole planet for every living thing. Let's look at the clues one by one, just like a detective finding secret hints to solve a puzzle. The first part says, "It is a part of us, and then replaced." Think about what you do every single day. Did you know that your body is made up of a lot of water? You need to drink water all the time to stay healthy, have energy for school, and play outside. As you live your day, some water leaves your body, like when you sweat while you are running or when you go to the bathroom. This water is the "part of us" that is used up, and it must be "replaced" when you drink a new glass or a bottle of water. This cycle happens constantly to keep you strong. Next, the riddle says, "It escapes out bodies, to a better place." When water leaves your body through your skin as sweat, or when you breathe out little clouds of vapor on a cold day, it is moving away from you. The riddle calls the outside world a "better place" because it is much bigger than a person. Once the water leaves you, it is finally free to go on a big, long, exciting journey into nature. Finally, the last part gives us the biggest clue: "The world becomes its sizeable home. Its passions unrestraint, the planet it roams." This describes the famous Water Cycle. Once the water is out, it joins the giant cycle of nature. It can evaporate and float high up to become a cloud in the sky. Then, it can fall back down to Earth as rain or snow, rushing into a lake or a powerful river. It is unrestrained, which means nothing is holding it back, and it gets to move and roam across the whole planet, traveling from the mountains to the sea in an endless, exciting loop. The riddle makes a simple drink sound like a grand, unstoppable world traveler.