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Vitamin B12, also known as cobalamin, is a water-soluble vitamin involved in metabolism.
It is one of eight B vitamins.
It is required by animals, which use it as a cofactor in DNA synthesis, in both fatty acid and amino acid metabolism.
It is important in the normal functioning of the nervous system via its role in the synthesis of myelin, and in the circulatory system in the maturation of red blood cells in the bone marrow.
Plants do not need cobalamin and carry out the reactions with enzymes that are not dependent on it.
Vitamin B12 is the most chemically complex of all vitamins,and for humans, the only vitamin that must be sourced from animal-derived foods or supplements.
Only some archaea and bacteria can synthesize vitamin B12.
Most people in developed countries get enough B12 from the consumption of meat or foods with animal sources.
Foods containing vitamin B12 include meat, clams, liver, fish, poultry, eggs, and dairy products.
Vitamin B12 is available as a supplement, and for the treatment of deficiency as an intramuscular injection.

The liver is a major storage organ of iron, in which excess iron is stored as ferritin and hemosiderin.

Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.

Wernicke’s area is the region of the brain that is important for language development.
It is located in the temporal lobe on the left side of the brain and is responsible for the comprehension of speech, while Broca’s area is related to the production of speech.
Therefore the correct option is B.

Angiology is the medical specialty which studies the diseases of the circulatory system and of the lymphatic system, i.e., arteries, veins and lymphatic vessels, and its diseases.

Smallpox was officially declared eradicated in 1980 and is the first disease to have been fought on a global scale. This extraordinary achievement was accomplished through the collaboration of countries around the world.
Smallpox vaccine – First vaccine.
Smallpox vaccine was invented by Edward Jenner.

It is well established that the brain uses more energy than any other human organ, accounting for up to 20 percent of the body’s total haul. Until now, most scientists believed that it used the bulk of that energy to fuel electrical impulses that neurons employ to communicate with one another.

All humans and many other primates can be typed for the ABO blood group. There are four principal types: A, B, AB, and O. There are two antigens and two antibodies that are mostly responsible for the ABO types.

Pneumonia claims the lives of the world’s most vulnerable children. Pneumonia remains the leading infectious cause of death among children .

Vitamin E supplements may prevent coronary heart disease , support immune function, prevent inflammation , promote eye health, and lower the risk of cancer. However, the research on these benefits is varied, and vitamin E supplementation is not right for everyone.

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