But coral also get energy from photosynthetic algae in their skeletons. If a form of coral evolved that drew all of its energy from such algae, could it not move out of the ocean?

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There is a growing tendancy to think of Man as a rational, thinking being, which is absurd.- Marvin the Martian.

It's gotten to the point where careful investigation is needed just to tell parody from reality. I think that means reality is broken.- Noclevername.