Extrusive Igneous rock that form from the fast cooling of lava on the Earth's surface will have which of the following type of crystals?

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 is the period of cell life when it is conducting

How do the evolutionary chart and the video support the claim that all living things are made up of cells?