c is for cat

Rules for Anchorites

Letters from Proxima Thule

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The simplest way to observe natural selection in action is to plate tons of wild-type bacteria on an agar plate with a drug on it, such as amphicilin or tetracycline. Most of the bacteria will die, but a few will have a random mutation that confers resistance to the drug, and they will live and reproduce (asexually) and you will get individual colonies descended from those survivors.

If you want a "real-world" example, consider your yearly flu shot. Influenza mutates at such a rapid rate that the shot you got in 2011 would not protect you in 2012.

Natural selection is not between "everything is as was created" and "everything becomes something rapidly different." Natural selection is the force the environment exerts upon a given species - the members of that species who are not advantaged die off, and the ones that survive propagate their more fit genes to their progeny. Over time (yearly, in the case of influenza; millions of years when it comes to higher species), in different environments that exert different selection pressures, that may result in different species evolving from one ancestor species.

I hope this explanation is helpful.

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