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Natural selection is a crucial component of evolution.

> This is a demonstration of natural selection, as the resistance was already resident in the DNA.

It doesn't matter which came first, the external pressure or the genetic trait. In both cases it's evolution.

To select you need to have options to select from.

Natural selection is a major component of evolution. The other is mutation, which produces the variation that natural selection operates on.

The paper specifically based its analysis on SNPs, a large fraction of which are novel mutations that did not exist in preexisting fixed alleles.