What are POPs? POPs are organic pollutants.
-Presistent
-Short-lived
-Permanet

An example of a POP is
-Sulfer Dioxide
-Nitrogen Oxide
-DDT

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

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.

Works together in the synthesis, modification, packaging, and transport of lipids and proteins