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Why evolution by natural selection didn't make use of RF?
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Gyro:

--- Quote from: Alex Eisenhut on August 27, 2023, 04:33:30 pm ---
--- Quote from: Gyro on August 27, 2023, 03:03:46 pm ---Derrr, because there is no known way of biologically generating RF and there was nothing to listen to on the radio while they were evolving?

--- End quote ---

Really? An electric eel discharging is probably generating some RF. Nervous systems generate RF and some animals apparently use that to hunt.

https://en.wikipedia.org/wiki/Ampullae_of_Lorenzini

Electric, magnetic, whatever...

--- End quote ---

Yes, there's a lot of electric field sensing used in water, even including sharks. The Electric Eel is a bit of an odd one - I still don't know how it doesn't fry its own head and tail, it must sting a bit! I doubt if its output rise time is fast enough to  count as RF though, it must still be triggered by the normal biological processes and speeds, but maybe there's some sort of avalanche process that occurs.

I think the OP could maybe have clarified the frequency range that he was thinking of.



--- Quote from: Alex Eisenhut on August 27, 2023, 04:34:26 pm ---Fireflies make light, that's THz RF, right?  ^-^

--- End quote ---

Ha, yes. optical frequencies are possible, but those come down to chemical mixing. I guess you could argue that the Bombardier beetle can generate pulses of slightly lower frequency when it ejects hot steam from its ass by the same means!  :D

https://en.wikipedia.org/wiki/Bombardier_beetle
jpanhalt:
1) Evolution did produce it.  We are proof of that.
2) Electric eels produce very low frequency AC at up to 500 Hz.  Our muscle action potentials might be considered another example and brain eeg is another example.  There are biological processes to produce alternating electric currents.
djsb:
Maybe some animals can detect the low frequencies of volcanic activity. Maybe this is why they scarper quickly in the movies. Or is this just Holywood fiction?
TimFox:
Volcanic activity can make low-frequency mechanical/acoustic vibrations, which could be detected by a sensitive animal.
Electric eels generate high-voltage pulses, but I assume there is a strong DC component.
coppercone2:
because the matter that is available here for biolgoical functions is most likely to make the systems that evolved. Who is to say what can happen if say uranium was a essential micronutrient for left handed triple helix life?

I assume its kind of like what you can put together with the junk box that you have.

How about instead of lightning the catalyst is some kind of weird triboelectric crystals under water arcing away?
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