<span>The range of human hearing is generally considered to be 20 Hz to 20 kHz, but it is far more sensitive to sounds between 1 kHz and 4 kHz. For example, listeners can detect sounds as low as 0 dB SPL at 3 kHz, but require 40 dB SPL at 100 hertz (an amplitude increase of 100).</span>
It must decrease the substance of the chemical I think
Plant And Animal Cells Are Eukaryotic.
Prokaryotic Are Single Cells
