In the lungs, the blood gives up and picks up . A: Carbon dioxide, nutrients

B: nutrients, oxegyn

C: oxegyn, carbon dioxide

D: carbon dioxide, oxegyn

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People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

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 is the name of the two satelites on mars