Check my answer!

which of the following describes a relationship of mutualism?

oxpecker birds eat parasitic ticks off the backs of zebras

a tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat

a polar bear catches a seal for dinner

birds feed off the insects that are stirred up from the grasses as cattle move through

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."