Can some one tell me what it means by number of tests.

What is called the "building block" of life?

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.

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?