How do researchers most often investigate the
role of the gut microbiome?
A. They use adult human subjects.
B. They use clinically depressed patients.
C. They use germ-free mice.
D. They use bacteria models.

ur answer is e & d

explanation:

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."