Which statements about freshwater sources are true? Check all that apply.
Only
about 3 percent of Earth's water is
fresh water.
Most of the fresh water on Earth is groundwater.
About 75 percent of the fresh water on
Earth IS frozen In ice sheets.
E The largest source
of usable fresh water IS aroundwater
1D More fresh water iS In the atmosphere
than in rivers and lakes.

How had the study of mitosis affected scientists knowledge of cancer

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.

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.