2. The stepper the gradient the more energy the stream has as it flows down.
3.. the higher the gradient, the higher the velocity and the ability to erode and carry sediment . As the gradient decreases toward the coast,stream velocity slows and the ability to transport sediment decreases.
The answer ur looking for is 600
You must just analyze the words. Replication is a synonym of copy, so the only possible answer is C.
Hope it helped,
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