Which of these cell junctions form a barrier to the passage of materials?
a. plasmodesmata
b. desmosomes (anchoring junctions)
c. keratin fibers
d. gap (communicating) junctions
e. tight junctions

e. tight junctions

Explanation:

Tight junctions -

It is the junction between the plasma membrane of the call with the near by adjacent cells , it acts as a barrier for the molecules and the ions from entering the cell or leaving the cell .

Hence , from the statement given in the question , the correct term is e. tight junctions .

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."