How do you determine if an object will float or sink when placed in water?

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.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

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