Lampreys are known to attach themselves to fish. In doing so they rasp off a section of the fish with hard keratinized structures and "feed" on the blood and fluid that oozes into their oral cavity. Fish can survive with a lamprey attached, but they have to expend extra energy swimming with the lamprey attached. This association would be designated a:________-
a) mutualism.
b) parasitism.
c) predation.
d) commensalism.