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Spider crabs live in the shallow regions of the ocean floor. Algae tend to grow on the surface of spider crabs. The algae provide the crabs protection from predators by camouflaging them. The spider crabs give the algae shelter. What does this description suggest?

AThe algae are parasites of the spider crabs.
BThe algae and the spider crabs have a mutualistic relationship.
CThe spider crabs are commensals, and the algae are parasites.
DThe spider crabs benefit from the algae living on them.
EThe spider crabs are parasites of the algae.