Question: Nudibranchs are snails that have no shell. They generally live on reefs and feed on algae, sponge…

Nudibranchs are snails that have no shell. They
generally live on reefs and feed on algae, sponges, or corals.
There are many holes in reefs that make excellent hiding places.
Why do nudibranchs use poisons and bright coloration to warn off
predators rather than just using the many available hiding places
in the reef?