> Similar[ly] the prevalence of other anatomical features such as spina bifida occulta and fabella has increased over the last 2–3 centuries. Evidence indicates

> Similar[ly] the prevalence of other anatomical features such as spina bifida occulta and fabella has increased over the last 2–3 centuries. Evidence indicates that changes in the natural selection pressures acting on these specific anatomical features could have caused microevolutionary processes, leading to the observed increases in prevalence rates. They seem to be suggesting that this is not necessarily an advantage. Modern medicine makes pregnancies with these genetic mutations more viable, so the dominance of the gene expression becomes a more significant factor than fitness.