Acatastrophe changed the climate of an area, causing a number of species to become extinct in a short period of time. a few new species evolved in the short period of time and were well adapted to the new climate. if documented this would provide evidence for

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.

Which type of neuroglia is found outside of the brain?

What is the cause hearing loss in human being