Question

Coral reefs are eurythermal

Answer 1

Most coral reef organisms are stenohaline & stenothermal. Coral reef structure. Corals reefs = rigid structures of calcium carbonate (CaCO3) built by colonial corals and calcareous algae. These wave resistant structures support biologically diverse communities of organisms in the tropical photic zone. 

Answer 2

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eurytherm is an organism, often an endotherm, that can function at a wide range of ambient temperatures. To be considered a eurytherm, all stages of an organism's life cycle must be considered, including juvenile and larval stages.