Vitamin b12 is important for the body to function. it keep nerve cells healthy, and it with the formation of red blood cells. when someone is vitamin b12 deficient, one of the reasons could be that the person’s is not the vitamin efficiently.

Vitamin B12; is a nutrient that helps keep the body's nerve, and blood cells healthy, and helps make DNA, the genetic material in all cells. It also helps to prevent a type of anemia called megaloblastic anemia that makes people tired, and weak.

Function: Sources of new cells, especially red blood cells, healthy nerves and tissues activates folate.

Sources: Animal products, including lean meats, fish, poultry, eggs, cheese, fortified foods.

Toxicity - None known

Deficiency - Pernicious anemia, macrocytic, anemia, nerve damage as indicated by tingling and numbness in the hands and feet.

Hope that helps : )

the person stomach is not digesting the vitamin efficiently.

format change of dna.  

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.