COMMENSALISM as the crab benefits as the sea anemone provides it with protection but the sea anemone doesn't benefits nor is harmed by the crab
clownfish and anemone, hermit crab and anemone, and some types of fish clean other fish to eat their dead scales and parasites.
no
the hermit crab attaches the anemone to its shell as protection from the big fish with the sharp teeth and octopuses and squids and you know what else is a hermitcrab YOUR MOTHERR:P
Usually the anemone will attach itself to the shell of the hermit crab for transportation as well as the ocassional food gathering. And the hermit crab recieves protection from the anemone through the use of the anemone's natural ability of stinging things that get too close.
When a sea snail dies, its shell eventually washes up on shore, where the hermit crab uses it as its new home. Therefore this would be commensalism, however since the snail already died there is no living symbiosis.
anemone.
This would generally be viewed as a symbiotic or mutual relationship. The anemone benefits by being transported to different locations, some of which may be richer in food supply. The crab benefits from the camouflage the anemone provides, the partial protection of having a stinging anemone in close proximity and also from pieces of food which the anemone may drop.
Commensalism
mutalism
Crabs and Shrimps often form commensalistic symbiotic relationships with anemones in tropical waters, again for the purposes of protection from predation. For instance the Anemone crab, Neopetrolisthes oshimai, which is a filter feeding Porcelain crab, lives and captures its food from within the tentacles of giant anemones.See related link for more details.
Its symbiotic though mostly for the crabs benefit - most anemones are sessile - that is fixed in place and get food from whatever comes by. A crab will actually take on in its claws and put it on its shell - even Hermit crabs will put one on their fake shells - this is to protect the crab. Anemones have stinging tentacles to protect themselves and with these crabs can protect themselves against predators, in particular Octopuses which would otherwise have the crab for a snack - its not just a one way relationship though - as the anemone is always around when crabs eat, they benefit from the messy eating habits, foods stuff float by and the anemone can eat them.
The boxer crab carries small anemones on its front legs to ward off attackers. The anemone might benefit by getting to eat the boxer crab's leftover food. If both benefit, it's mutualism. If only one benefits and the other is unharmed, it's commensalism.