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.
4 because if you have a infection it causes you not to breath properly
I hate to ask and sound stupid, but the drug or the basic chemical?
