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Stoicism.
Bring that shit back.
The term 'microevolution' has recently become popular in the anti-evolution movement, in particular among young Earth creationists to distinguish between evolutionary changes among populations which can interbreed (microevolution) and changes among populations which cannot interbreed (macroevolution). The main argument is that change beyond the species level would require similar enough changes in both a male and female in the same place and time, and that those two would have to successfully interbreed in order to create a sustainable population. Although theoretically possible, the combination of factors are seen to be so improbable as to become implausible.
The claim that microevolution is qualitatively different from macroevolution is fallacious, as the main difference between the two processes is that one occurs within a few generations, whilst the other takes place over thousands of years (i.e. a quantitative difference). Essentially they describe the same process; although evolution beyond the species level results in beginning and ending generations which could not interbreed, the intermediate generations could. Even changes in the number of chromosomes can be accounted for by intermediate stages in which a single chromosome divides in generational stages, or multiple chromosomes fuse. A well documented example is the chromosome difference between humans and great apes.
The attempt to differentiate between microevolution and macroevolution is considered to have no scientific basis by any mainstream scientific organization, including the American Association for the Advancement of Science. Contrary to belief among the anti-evolution movement proponents, evolution of life forms beyond the species level ("macroevolution", i.e. speciation) has indeed been observed and documented by scientists on many occasions.