Ship A and Ship B are sailing along the equator. The difference in local time is 3 hours. What is their difference in longitude? a.) 3 degrees
b.) 15 degrees
c.) 45 degrees
d.) 60 degrees

Which best describes the structure of dna?

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

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.