You need to go to basic cell biophysics and understand the frequency windows of cell communications and their varied and specific pulse forms. They differ a lot from the constant near-steady state wide frequency radiation coming from solar and cosmic sources. Human biology has adapted and grown around the latter for a few million years (longer if you start from single cell organisms).

I suggest this as a starting point:

Markov, M.S. (Ed.). (2015). Electromagnetic Fields in Biology and Medicine (1st ed.). CRC Press. https://doi.org/10.1201/b18148

A higher level view is offered in Levitt et al. 3-part paper series, start with paper 2:

Levitt, B. Blake, Lai, Henry C. and Manville, Albert M.. "Effects of non-ionizing electromagnetic fields on flora and fauna, Part 2 impacts: how species interact with natural and man-made EMF" Reviews on Environmental Health, vol. 37, no. 3, 2022, pp. 327-406. https://doi.org/10.1515/reveh-2021-0050

Come back when you are able to differentiate those from pure black body radiation and the approximation of that form the sun, and their subsequent effects on mammalian biology.