Which brain vesicle gives rise to the midbrain and cerebral aqueduct?

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.

Actual age your first developed of age well comparison age refers to absolute age true or false

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry