selection pressure The pressure exerted by the environment, through natural selection, on evolution. Thus, weak selection pressures result in little evolutionary change and vice versa.
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Selective Service Acts Conscription Act 12 Stat. 731 (1863) Burke-Wadsworth Selective Training and Service Act 54 Stat. 885 (1940) Universal Military Training and Service Act 62 Stat. 604 (1948)