Where do most phosphates and nitrates in the chesapeake bay come from? air pollution shellfish farms agricultural runoff factory discharge

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.

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas

True or false most plants are c3 plants, because they use molecules of carbohydrate known as g3p in their photosynthesis process.