Question

how might a coral be affected if all its symbiotic algae died

Answer 1

Welcome to OpenStudy, not sure how to explain this.. Here's a link.
http://ocean.si.edu/corals-and-coral-reefs

Answer 2

not a lot of help but thanks

Answer 3

The coral would either adapt or die. A symbiotic relationship is a relationship in which both organisms benefit. Thus since the coral no longer obtains the benefits of it's relationship with the algae it will either find a new relationship, evolve a new adaptation, or die.