A deficiency of riboflavin can be primary - poor vitamin sources in one's daily diet - or secondary, which may be a result of conditions that affect absorption in the intestine, the body not being able to use the vitamin, or an increase in the excretion of the vitamin from the body.
Substantial evidence means more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.. Richardson v. Perales, 402 U.S. 389, 401 (1971).
factual evidence is a true fact of life that is supported by its evidence. 11 people found this useful. Edit. Share to: 1  All about Circumstantial Evidence Circumstantial evidence is evidence that does not directly indicate that something is true; it can however, be used to deduce what is highly probably to be true.