Question

what are the neon \advertising signs\ of the ocean called?

bioluminescent corals

glow worms

electric signs

fire plankton

Explanation:

Bioluminescent corals are organisms in the ocean that can produce light, similar to neon advertising signs. Glow worms are typically found on land. Electric signs is a very general and not - specific - to - ocean term. Fire plankton is not the common term for such "neon signs" of the ocean.

Answer:

Bioluminescent corals