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The term evolution engine denotes the different parts that simulate
the Darwinism in Evolutionary Algorithms.
The fittest individuals are more likely to reproduce and survive.
Darwinism takes place in two different phases of an EA, though in many popular variants, only one phase is activated.
Selection is the Darwinistic choice of parents
that will be allowed to reproduce.
Replacement takes place after reproduction,
and is the Darwinistic choice of those individuals that will survive,
i.e. become the parents of the next generation.