Image above: Glowing corals entice nutrients like small water insects. Why are species advancing? The reason for that is that the species must get nutrients. And they must get descendants. The challenge is that if the species is good prey for hunters it dies before it can make descendants. If the hunter is too dominating, it eats its food to end. And that thing can cause extinction. Same way, if some animal is a too easy target. That causes extinction. For success, the species must ensure its nutrient source. Without nutrients, the species is gone. So, that's why corals are glowing. Glowing corals are a good example of how a thing that seems meaningless has a big role in evolution. When we think about the reason why corals glow, we can answer that the glow of corals is meant to entice food. Because bioluminescence increases the nutrient level of corals higher than corals that are not glowing, that makes glowing corals stronger. And they will take over space from other ...