Light arriving at a concave mirror on a path through the focal point is reflected
A) back on itself.
B) through the focal point.
parallel to the principal axis.
D through the center of curvature.

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.

Differentiation of cells changes the nucleic information. true false

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity