Evolution is a continuous process, so yes, there's some degree of change every generation. It is also true that 11,000 years is a very short time on the scale

Evolution is a continuous process, so yes, there's some degree of change every generation. It is also true that 11,000 years is a very short time on the scale of speciation. It's probably most useful to think of worms coming back in to the soil as another stage of progression, just like the stages of a forest returning after a fire, volcano or the like.