Spider crabs live in shallow areas of the ocean floor, and greenish-brown algae lives on the crabs’ backs, making the…

Spider crabs live in shallow areas of the ocean floor, and greenish-brown algae lives on the crabs’ backs, making the…

Spider crabs live in shallow areas of the ocean floor, and greenish-brown algae lives on the crabs’ backs, making the crabs blend in with their environment, and unnoticeable to predators. The algae get a good place to live, and the crab gets camouflage. What symbiosis is this?