I believe it is muscle cells, I'm sorry if this is incorrect.
The cell is the smallest functional unit of life, which is why it is sometimes referred to as the building block of life.
The answer to this question would be frequency.
The pitch of a sound makes is directly related to the frequency of the vibration. For every octave, the number of frequency will be increased 2 times. The frequency is influenced by various things. Changing the length of the instrument is the easiest method to change the frequency.
