All of the following are examples of secondary sources except:
a. a biography of otto von bismarck
b. a letter from a soldier who fought in the napoleonic wars
c. a world history textbook
d. a dvd on the battle of normandy

Which are observations about the tree on the right ,? check all that apply

Which of the following is not a product of the second stage of glycosis

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.