The first and last sounds most reasonable, but I will go with the last one.
Plagues wiped out the entire crop in a large region
I think this one fits: <span>C. It has a small temperature range during the summer. As there's much greater temperature range in summer than in alpine biome.</span>
<span>The answer is Leukoplakia.
When you have this condition, there is a thickened, white patches that form on
your gums, the interiors of your cheeks, the bottom of your mouth and, occasionally,
your tongue. These patches can't be scratched off. Specialists don't know what the
source of leukoplakia is but consider chronic irritation from tobacco — whether
dipped, smoked, or chewed — to be the main reason in its development. Most
leukoplakia patches are noncancerous meaning that they are benign, though some
show initial signs of cancer. Cancers on the bottom of the mouth can happen
next to areas of leukoplakia. And white areas varied in with red areas
(speckled leukoplakia) may specify the potential for cancer. </span>
The sodium-potassium pump does not allow the movement of sodium molecules against their concentration gradient into the cell with the use of ATP molecules.
In sodium-potassium pump, the sodium moves outside the cell whereas potassium moves inside the cell with the help of using ATP molecules. The sodium-potassium pump maintains the gradient of higher concentration of sodium extracellularly means outside the cell and a higher level of potassium intracellularly means inside the cell. This process is done only in the presence of ATP molecules that provides a force for the movement of sodium and potassium so we can conclude that no movement of sodium occur inside the cell in the sodium-potassium pump.
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