The figure below shows two hypothetical streams that have identical cross-sectional areas but different channel shapes.Assuming all other factors are equal,stream ________ will have the fastest flow because of the difference in ________. 
Definitions:
Mental Rotation
This term refers to the cognitive process of mentally rotating spatial objects or figures to recognize them or to see how they would appear from different angles.
Complex Polygons
Geometric figures with three or more sides, characterized by their intricate shapes, angles, and sometimes non-convexity.
Mirror Image
A mirror image is a reflected duplication of an object that appears identical but reversed, often used metaphorically to describe things that are very similar yet opposite.
Chance Accuracy
The likelihood of making correct decisions or predictions by random chance in a given situation.
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