HELP I DONT UNDERSTAND

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.

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

The function of the excretory system is to control homeostasis and