19) what does this mean that “cells turn on different genes”? A) cells will only turn on, or express, the genes whose proteins are needed.

B) all of the above

C) all cells have different genes, giving them different functions.

D. All cells turn on different genes, giving them different functions.

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the correct answer is c   with the systems

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."