The human population exploded and without natural selection pressure, fecundity in the types economic activity flourished.

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Unfortunately, such promiscuous use of drugs is the best way to put selection pressure on the worms and encourage the evolution of resistant strains.

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Of course, low genetic variation means that selection pressure is higher.

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This creates a selection pressure which drives the genes through the population, as the offspring of wild flies die more often than those of engineered or hybrid flies.

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Adaptable back-row Jon Thomas is also a probable but the resurgence of Owen, a natural number eight who impressed as a stand-in lock, could put selection pressure on the Osprey.

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The machine uses induction heating combined with pressure cooking, automatically adjusting the amount of pressure depending on the menu selection.

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Under-pressure O'Sullivan said that selection was due reward for the players in form.

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