[bobdsmith]

What event, or events, does natural selection explain, that isn't already explained by mutation, drift, recombination, and heredity.

The effect that traits that aid an organism to better reproduce will tend to be fixed in the population, while those that hinder reproduction will tend to be lost.

This isn't explained by mutation - it would still occur in absense of mutation.

This isn't explained by drift - it would still occur in absense of drift.

This isn't explained by recombination - it would still occur in absense of recombination.

This isn't explained by heredity. Heredity is needed for natural selection to work, but it isn't the only thing that is needed.

[csense]

The effect that traits that aid an organism to better reproduce will tend to be fixed in the population, while those that hinder reproduction will tend to be lost.

This isn't explained by mutation - it would still occur in absense of mutation.

This isn't explained by drift - it would still occur in absense of drift.

This isn't explained by recombination - it would still occur in absense of recombination.

This isn't explained by heredity. Heredity is needed for natural selection to work, but it isn't the only thing that is needed.

Well, then what is this physical process that acts on an organism that can explain the occurance or disappearance of traits that these other processes can not?