A polysaccharide known as glycogen. Glycogen is made of repeating subunits of glucose, which are the quick-energy carbohydrate in animals.
I believe that is the definition of Abyssal Pains.
Answer:
Parasitism
ExplanatioThe flatworm seems to be the only one benefitting from the relationship because it is using the snail as a host and provides it a place to grow but the snail is being harmed by the worm while doing so. Therefore the relationship is parasitic.
That will be once every year
