Possibly Symbiotic or Parasitic Relationship?

The algy does not fossilize, but there are features we can look at to see if maybe trends between photo, synthetic and aphoto synthetic corals might persist in the fossil record. Not all corals to day have algi because if you live deep down where there's no sunlight, you don't need it. Deep sea coral, such deep sea cold water corals, as they are called, only feed cause they can't photo synthesize. They've looked at those corals versus the normal corals we typically think of,. for the signal of the nitrogen isotopes in these two sides. And then we can look on fossil coral to potentially be able to identify at least where

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