As Garcia puts it: «Men's orgasm rates are likely under strong selective pressure (in evolutionary biological terms) so insofar as orgasm is tied to male ejaculation — which has clear reproductive consequences — we expect that males likely orgasm relatively predictively with familiar partners.» (health.com)
«These findings suggest extremely strong selective pressures against small body sizes which shifted the evolutionary spectrum towards the larger bodies we have today.» (sciencedaily.com)
Under the right circumstances, a single E. coli bacterium, for instance, can divide into a 2,097,152 — strong colony in a mere seven hours — and with each division comes the potential for mutation and adaptation, particularly if these organisms are exposed to strong selective pressures. (fortune.com)