Apopulation of plants growing on an island consisted of two varieties one with thorns and the other ones without. over a period of many years the variety with thorns gradually disappear. which process most likely brought about this change in the plant population

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.

Predict the results of a two base insertion or deletion in a strand of dna that codes for a protien, how does this differ from a three base insertion or deletion?

Compare the composition of the moon's surface with the composition of the earth's surface.