One might interpret this statistic as a profound cultural phenomenon related to certain biological adaptations to environments having limited carrying capacities. (religion-online.org)
But the neat concept of adaptation to the environment driven by natural selection, as envisaged by Darwin in On the Origin of Species and now a central feature of the theory of evolution, is too simplistic. (newscientist.com)
Instead, he argued from a mass of evidence collected in different parts of the world, that «species» had originated by natural selection, by adaptation to the environment and by gradual evolution. (religion-online.org)