since rotifers have cilia, why must they be classified in a separate group rather than included with the ciliate protozoa?

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.

What re the two main phrases of the cell cycle.

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms