Which type of niche applies to the clownfish? A. broad niche
B. medium niche
C. common niche
D. narrow niche

Select all the true statements about the cosmic microwave background radiation

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.

Variety of living organisms; includes genetic, species, and ecological types.