Carbonyl Compounds: Complete the following mechanism involving 5-aminopentanal Draw a reasonable mechanism for this reaction with trace acid. Use another equivalent of the molecule acting as the acid/base.

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.

Would really appreciate it, i have an idea but not completely sure

Which would be the most useful source of evidence to support mcneill's contention?