Which of these is a trait that has probably been selectively bred for by human beings?

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.

An easy way to calculate the amount of energy available at each level is to what?

Explain why phospholipid molecules form a bilayer. (3 marks)