Crystals most often form in igneous and metamorphic rocks. According to the rock cycle, which processes and features do these rocks share that likely promote the formation of crystals?

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

answer; i believe the answer is (polygenic inheritance;