From my observations. I think saying that it requires a lot of energy. To say that there must be a sound. Sound: sound energy. This is the energy in the sound energy, but communications requires an intermediary. An intermediary, that is the air. But the sound energy is energy that is caused by an action from the us. Examples of sound energy as the energy from the talk. Energy that is derived from the musical instruments from tapping the other animals and the sound of the bash. Based on an idea of the sound energy is energy that is very important is missing. Because we need to use on a regular basis.
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