describe how the consumer in one level of the pyramid obtain energy from the organism at the previous levels of the pyramid.

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.

What are the 3 types of artificial cloning

Scientific evidence is most likely to be consistent if it is based on data from