It Couldn't Just Happen is a book that explains all about
symbiosis in chapter 13. Since the flashlight fish lives below 375
feet, where there is no light, it needs a flashlight. Bacteria
actually lets off a glow. So the flashlight fish keeps bacteria in
a special pouch, and now it can turn its "flashlight" off and on
whenever it wants to. On the other hand, Bacteria cannot survive
outside of the flashlight fish's pouch. This is a perfect example
of symbiosis, and it shows how magnificent, loving, and perfect our
Creator, God, is.
-Anna