Did the addition of rooting compound make any difference in the time it took to develop roots? did it make any difference in the length of the roots produced?

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.

Does the sun release radiant energy?

What types of energy transfers and energy transportations are involved in the domino chain reaction?