Cells lining the gut need to take in glucose, but the concentration of extracellular glucose is LOWER than the concentration already stored in cells. a)active transport
b)simple diffusion
c) facilitated diffusion​

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 can you approximate the number of calories required to keep you in energy balance?

Look at the photo of the leaf. which term best describes this leaf?