When a plant or animal is injured, where will it get the raw materials that it needs to repair itself?

Many animals and plants regenerate tissues or even whole organs after injury. Typically, specialized cells at the wound site revert to a 'pluripotent' state–via a process called dedifferentiation—which means they regain the ability to develop into the various cell types required for regeneration.

Explanation:

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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.