What letter is representing the 1st Half-Life of the parent element. How do you know?

it has one origin of replication, but it proceeds in two directions - d)

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."

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher