Answer:
the answer is going to be c
The answer is a Scroll bar, the description fits perfectly because you need to move it to see more of the content you are viewing, and it wont be completely. when the item does appear completely on screen then the bar is relatively large and there is no need for scrolling, however the opposite occurs during when you cannot see all of it.
Answer: "hierarchy" .
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When permanent magnets of a motor are replaced with more powerful ones, the motor rotation will increase. This is because there is more electricity being generated.
