An experiment is designed to compare the differences in learning outcomes between learning math from a video game and learning it from traditional
classroom activities. The experiment finds no difference between the two.
Which experiment method is important for controlling bias?
A. Using classroom activities with researchers input
B. Asking the subjects which group they preferred to be in
C. Developing a video game with subjects' input
D. Randomly assigning students to the two different groups

True i belive sorry if i am wrong

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Through the process of sedimentation,sediment is turned back to rock to form sedimentation.the process of sedimentation is: > deposition-where fragments were deposited into the river or sea under gravity or travelling agent such as wind or water. > sedimentation-the fragments deposited in the river sedimented and accumulate> compaction-the layers of fragments deposited undergoes compaction due to the weight if the upper layers> cementation-chemical substance of the fragments such as cement dissolved into the water and cement the other fragments together to form sedimentary rock.thus,cementation and compaction are the process.on the other hand, transformation only occur when a rock under goes metamorphism(compaction or extreme heat).while recrystillization occurs when a rock is melted and cooled down,which also requires metamorphism to take place.hope it !