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Principle#1 Genetic variation:The seals are an animal thats very calm there safe from predators on top of ice.
Principle#2:Overpopulation and selective pressures:One of the selective pressures is that the killer whale comes along towards the seals when theres one seal alone the pack of killer whales go after that one but it backs off of how it doges them.
principle#3 Differential survival and reproduction: with the predators out of the way the seals can reproduce with out any problems coming there way
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