Final answer:
The phenomenon where looking at a waterfall and then seeing stationary objects move is known as the motion aftereffect or waterfall illusion, not related to the terms given in the choices. It's a visual illusion due to motion detectors in the visual system. Additionally, the salmon's migratory behavior is an example of an innate behavior driven by genetics.
Step-by-step explanation:
If you look at a waterfall for a long time and then look away, it will appear as though everything is moving upward. This phenomenon is known as a motion aftereffect or waterfall illusion. This visual illusion occurs because of the motion detectors in your visual system adapting to the movement you've been watching.
When you look away, these detectors are still firing but without the consistent input of the falling water, so the relative motion is perceived in the opposite direction of the original movement. This is not related to any of the answer choices provided (A. Absolute performance, B. Pay-for-performance, C. Relative performance, D. Risk sharing, E. Herding). These terms are mostly related to business or economics rather than biology or visual perception. It seems there might be a confusion in the question provided.
As for the information provided about a species of salmon migrating up the same river despite predator risks: this behavior shows the strong instinctive nature of salmon to return to their birthplace to spawn, regardless of potential increased dangers such as predators. This is an example of an innate behavior encoded in their genetics, which drives their impressive migratory patterns.