Why are a sea cucumber and a crab and shrimp Symbiotic?

Sea cucumbers, crabs, and shrimp can engage in symbiotic relationships primarily for mutual benefit. For instance, certain shrimp and crabs may inhabit the crevices of sea cucumbers, gaining protection from predators while helping to keep the sea cucumber clean by removing debris and parasites. This relationship enhances the survival of both parties, as the shrimp and crab receive shelter and food, while the sea cucumber benefits from reduced parasitic load.