Major biotic factor that affectd the health of coral reefs

Overfishing and destructive fishing methods, climate change, global warming, tourism, pollution.

not sure if this is what you'r looking for eubacteria and archaebacteria

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101