In the diagram, is parallel to . Also, is drawn such that the length of is half the length of . If sin A = 0.5, then what is sin E?

A.
2
B.
1
C.
0.5
D.
0.25
E.
0.1

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.

When water freezes, it . contracts expands

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment