Why is this the answer?

The answer is snowman because this clever riddle tells the whole life story of the favorite frosty friend you build outside in the wintertime. Let us look closely at all the hints in the poem to see why. The first part of the riddle says, "They made me a mouth, but didn't give me breath." Think about how a snowman is created. It is not born like a baby or hatched from an egg. Instead, people, often children, lovingly gather lots of snow and roll it into big, round shapes. After stacking the snowballs to create the body, the builders will add a face. You use small stones, buttons, or pieces of charcoal for the eyes, and a curving stick, a scarf, or a piece of carrot for the mouth. So, a person definitely makes the mouth. The riddle is right to say the snowman was not "given breath," because it is not a living creature. It does not need to breathe air like we do to stay healthy and keep going. Now for the next line: "Water gives me life." What is snow made of? It is just frozen water! When the weather is very cold, the water vapor in the sky freezes into beautiful snowflakes, which is the perfect building material. The riddle uses the word "life" because without the snow, which is the water, you cannot make your snowman at all. The more of that cold, beautiful water you pack together, the bigger, stronger, and longer your snowman can stand tall and proud in the yard. The last clue tells us, "But the sun brings me death." This describes the natural end of the snowman's winter adventure. As the season changes and the sun begins to warm the air, the heat causes the tiny ice crystals in the snow to melt. The snowman starts to slump and slowly shrinks, and all its material turns back into water, soaking into the earth. When all the frozen water is gone, the snowman disappears completely. The sun’s warmth is what brings the melting and the end of the snowy fun. This riddle is a perfect word puzzle that describes the beautiful, short journey of your friend made of ice and snow.