Two processes that lead to genetic variation in daughter cells

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

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.

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?