Certain flightless beetles have wings that have no function. the wings are an example of which type of structure?

The wings on the beetles are examples of vestigiality. Vestigiality is a structure with attributes that have apparently loss its ancestral function but stil present during evolution. It is a normal evolutionary process in the changing environment that does not pressure them to evolve.

work input is how much work you put into a machine and work output is the work done by the machine according to how much work you put into it. i think?

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.