Which best describes the relationship between population size, carrying capacity, and limiting factors?

The size of a population usually stays high due to its carrying capacity and limiting factors.
The size of a population usually stays near its limiting factors due to carrying capacity.
The size of a population usually stays near its carrying capacity due to limiting factors.
The size of a population usually stays low due to its carrying capacity and limiting factors.

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 causes temperature extremes in the desert

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?