The earliest known vitamin is:

What are the trace components of our food?

Marasmus is caused by a deficiency of . . . . . . .

Which of the following is the matching pair of the deficient nutrient and the resulting disease in which the patient develops swollen lips,thick pigmented skin of hands and legs,and irritability?

Deficiency of Vitamin $A$ results in ...... .

What is the average daily caloric requirement for a normal human (in $\text{ kcal}$)?