Fish-liver oils contain large amounts of

Water is generally found in liquid form because ........

Energy currency of the cell is:

The given structure represents a low molecular weight organic compound found in living tissues. Identify the category and the missing component $X$ in the structure.
Category $-$ Component

Deficiency of which of the following leads to dermatitis,diarrhea,and dementia?

Which of the following metals is present in vitamin $B_{12}$?