Which organelle is marked with an X?

The chloroplast.

Explanation:

The chloroplast is green and has small stacks inside of it. From the picture, the organelle labelled fits that description. Also, none of the other option choices fit. The vacuole is the big blue organelle, the nucleus is the purple thing, and the lysosome is the small yellow organelle scattered about.

Anyway.. hope this help <3

the real answer is b. scintillation counter

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."