Why is this the answer?

The answer is wind because this wonderful riddle paints an amazing picture using words to describe something you can feel all the time, even though you can never see it. It is like a secret code for the air moving all around us. Let us look at the clues one by one, like a detective solving a fun mystery. The first line says, "Voiceless it cries." When you hear a storm or a really strong breeze outside, the wind makes loud howling and whooshing sounds. It sounds like it is crying or shouting! But the wind does not have a mouth or a voice box like a person or an animal, so it is crying without a voice. That is why it is voiceless. Next, the riddle says, "Wingless flutters." Think about what happens when the wind blows. It can make flags wave, leaves dance and spin on the ground, or even make your shirt flutter in the air. All these things are moving or "fluttering." But the wind itself does not have any wings, like a bird or a butterfly, to fly around. It just moves the air, making everything else flutter. The third line is, "Toothless bites." Sometimes, especially on a cold winter day, when the wind blows on your cheeks, it feels cold and sharp. It feels like tiny, quick little bites or pinches on your skin! But we know the wind does not have any teeth, so the bite is toothless. It is just the chilly air making you shiver. Finally, the riddle says, "Mouthless mutters." When the wind is soft and gentle, you can sometimes hear a low, quiet humming sound as it passes through the trees or around a building corner. It is a soft noise, like a secret whisper or a mutter. Since the wind has no mouth, it is muttering without a mouth. This old riddle is so clever because it uses fun words to describe the wind's actions and sounds, without ever telling you exactly what it is. The wind is the only thing that can cry without a voice, flutter without wings, bite without teeth, and mutter without a mouth.