C.high humidity is the characteristic of Rub al Khali
A lack of intrinsic factor, leading to a deficiency of vitamin B12 and causing an appearance of large pale cells called macrocytes, is characteristic of pernicious anemia
<u>Explanation:</u>
Anemia is a state in which the body does not have sufficient healthful red blood cells. They give oxygen to body muscles. There are several kinds of anemia. Pernicious anemia is a reduction in red blood cells that transpired when the intestines not able to suitably receive vitamin B12.
One can receive this vitamin from consuming foods such as meat, chicken, invertebrate, eggs, and dairy goods. A unique protein, called intrinsic factor (IF), connects vitamin B12 so that it can be occupied in the intestines. When the stomach is not able to obtain sufficient intrinsic factors, the intestine cannot accurately grasp vitamin B12.
