Stabilizing selective pressures result in a.. rapid, broad evolutionary changes. b.. limited evolutionary changes. c.. an increase in genetic diversity. d.. extreme gene distributions. directional selection can be distinguished from disruptive selection by a.. the elimination of extreme variations of traits. b.. selection for two extreme variations of a trait. c.. the preservation of gene frequencies. d.. selection for one extreme variation of a trait

Which would prevent a plant from growing? oa. lack of sunlightob. no supply of lithiumoc. too much waterd. too many monosaccharides

When organisms are classified ,they are given a two part name

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.