Ophiolite
Recalcitrant Procrastinating Ape
Or witness the global example we have on our doorsteps. Omicron is replacing delta because it is "better" - spreads faster, spreads more easily, doesn't kill as many hosts. It's won the lottery. (And it's not even alive!)If they give you an advantage, and generations of your offspring pass on this advantage to their offspring, and so are more successful in producing and raising young than average, over many generations those genes may spread through the population, becoming the new successful standard. That is evolution (simplified).
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