What is the bottom side of the worm called?

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.

What type of specimens where you able to see under each of the microscopes in the microscope activity

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?