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There are more bacteria in the world than there are grains of sand on all of the beaches of the world (and many grains of sand are covered with bacteria).They exist in just about any environment: hot, cold, dry, wet, high pressure, low pressure, small groups, large colonies, isolated, much food, little food, much oxygen, no oxygen, in toxic chemicals, etc.
To make any lasting change, a beneficial mutation would have to spread ("sweep") through a population and stay (become "fixed").They wrote that "forward experimental evolution can often be completely reversed with these populations". Mutations that result in a gain of novel information have not been observed."Despite decades of sustained selection in relatively small, sexually reproducing laboratory populations, selection did not lead to the fixation of newly arising unconditionally advantageous alleles." "The probability of fixation in wild populations should be even lower than its likelihood in these experiments." --Burke, Molly K., Joseph P. Most long-term evolution experiments thus far have been performed in bacteria or haploid yeast populations, where, in most environments, there exist a number of loss-of-function mutations that provide a selective advantage." "For instance, sterility in yeast provides a selective advantage by eliminating unnecessary gene expression." "The emergence of the Cit phenotype is the exception in experimental evolution, where most evolved mutations affect independent genes and biological pathways, driven largely by large-target loss-of-function mutations."This candid admission is from the evolutionist journal Nature: "Darwin anticipated that microevolution would be a process of continuous and gradual change.To evolutionists, this idea has been essential for so long that it is called a "classic sweep", "in which a new, strongly beneficial mutation increases in frequency to fixation in the population."Some evolutionist researchers went looking for classic sweeps in humans, and reported their findings in the journal Science. Lenski is an evolutionary biologist who began a long-term experiment on February 24, 1988 that continues today."To evaluate the importance of classic sweeps in shaping human diversity, we analyzed resequencing data for 179 human genomes from four populations". You may have heard of the famous Lenski experiment. It looks for genetic changes in 12 initially identical populations of Escherichia coli bacteria that have been adapting to conditions in their flasks for over 60,000 generations.