The one concept missing in this thread is what of the role of predator. The shark had no predator until man. Now, if through an evolutionary process it could gain the intelligence to either negate this threat or avoid it that might ensure its survival.
If one is to take the roots of mankind as being in Africa then he had many, many predators to contend with once he left the safety of the trees and walked upright. Short of acquiring the ability to run fast it could be argued that intelligence was for him the quickest route to survival. Try and negate the problem by first trying to move away from it. Hence the migration north.
The role of predator in all its forms, from the lowly praying mantis in nature to the CEO of the largest bank in modern society cannot be ignored or underplayed in the impact it has on the life course of any species - be it modern man or animal.
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