Answer:
Option B, Beriberi
Explanation:
Thiamin is caused due to the deficiency of vitamin B-1 /thiamine whose chemical name is thiamine pyrophosphate. Thiamin is a water soluble vitamin which occurs naturally and is a very essential nutrient as it plays an important role in energy metabolism and hence regulate the growth, development, and function of cells
Thiamin is stored in liver for a short duration as its life is extremely short and thus it should be ingested regulary.
The deficiency of thiamin causes beriberi and thus food like whole grains, meat, fish breads, cereals etc. must be taken in sufficient amount regularly.
Human skin color is a polygenic trait, which means that multiple gene loci (with different alleles) are involved in its expression. It has been shown that there more than 350 genetic loci involved in determining skin color. Because of that, there is the enormous number of possible genotypes for the skin color and as a result, the phenotypes vary from the darkest brown to the lightest hues. Different populations have different allele frequencies of genes for human skin color, and the combination of these allele variations brings about complex and continuous variation in skin coloration. Natural skin color can change due to exposure to sunlight (becomes darker) and that is the way it adapts to intense sunlight irradiation (protection against the UV exposure).
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In 1969, whittaker proposed moving the prokaryotes from the kingdom plantae to a separate kingdom due to structural and metabolic differences.
