How does the extinction of a species affect humans ? a. extinction contributes to the loss is natural food sources. b. extinction generates new sources of medicine c. extinction keep air and water clean d. extinction makes the environment more pleasant

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."