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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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Then they would be plants. They would also need something other than calcium carbonate for their skeletons since they won't be able to extract it from sea water. Cellulose wood do.
We might have to increase the atmospheric pressure and perhaps world temperature to get higher humidity. Then perhaps we could have floating air plankton for the land coral to feed off.