Which of these enters the citric acid cycle (also called the krebs cycle)?

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.

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z