Talk about unlicensed low power AM... this article is a lesson in both bacteria and amplification modulation..
https://scitechdaily.com/scientists-discover-radio-like-communication-in-ancient-bacteria/
Cyanobacteria use an AM radio-like principle to coordinate cell division with circadian rhythms, encoding information through pulse amplitude modulation.
Cyanobacteria, an ancient group of photosynthetic bacteria, have been discovered to regulate their genes using the same physics principle used in AM radio transmission....
In AM (amplitude modulation) radio, a wave with constant strength and frequency – called a carrier wave – is generated from the oscillation of an electric current. The audio signal, which contains the information (such as music or speech) to transmit, is superimposed onto the carrier wave. This is done by varying the amplitude of the carrier wave in accordance with the frequency of the audio signal....