Bioluminescense, one example being the lighting up of a firefly, is thought to have evolved 40-50 times in independent creatures based on studies.
How does that ability supposedly evolve??
“Evolutionists assume that it is ‘easy’ to evolve the capacity for bioluminescence, based on their assumption that the phenomenon has evolved in parallel so frequently. “The ingredients are usually not hard to come by. Stand in the dark, mix some egg white with oxygen and luciferin from, say, a jellyfish, and you’ll probably get a flicker of blue light,” suggests a recent article in National Geographic.9
But the deeper question is, how did any such mechanism come about on its own? Bioluminescence involves both an enzyme and a luciferin, plus a control mechanism integrated with an organism’s nervous system, as well as genetic information to control both the development and the operation of light-emitting organs. Evolutionists have not plausibly explained how this extremely complex mechanism could emerge in a step-wise process, since each stage would have to be fully functional in order to be preserved by natural selection.”
Read more here: https://creation.com/bioluminescence-the-light-of-living-things