Ulla, Steve,
Do “organisms use biophotons to exchange information”?
Maybe. But first, one must define what one means by “information”:
In order to be useful to a real-world mathematical system, information can only be the system’s time-place knowledge/ awareness of what numbers, categories and relationships are on-the-spot currently true.
This is because existence does NOT imply knowledge of existence. The mere physical existence of numbers, categories and relationships does not imply that a real-world mathematical system would know about their existence. So, knowledge/ information is a necessary part of a real-world mathematical system.
So, information is NOT physical: information is knowledge of the physical.
Information is the real-world system’s time-place knowledge/ awareness of itself. This information is possessed by the time-place elements of the real-world system, i.e. physical matter.
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Masses and masses of basic-level information (about numbers, categories and relationships) is not much use to a living organism, and this basic-level information must undergo quite a bit of collation and analysis by the organism, in order to acquire higher-level, more useful, summary information about the organism’s current situation.
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Organisms might have low-level biophoton particle interactions. And obviously, these particle interactions would change the current time-place physical situation of the organism; so the organism's current time-place knowledge/ awareness/ information about its physical situation would also change.
But organisms can’t “exchange information” as such because information is an individual time-place organism’s time-place knowledge/ awareness of its current physical situation.