A scientist thinks she has discovered an essential nutrient for humans,because this substance is ________.
A)in most natural foods
B)needed for the normal development of human cells
C)easily manufactured by chemists
D)required by cats and dogs

Question

Quizplus · Accepted Answer

An essential nutrient is a substance that is required for the normal development of cells in the human body. Therefore, choice B is the best answer as it describes a substance that is needed for the normal development of human cells. The other choices do not necessarily indicate the discovery of an essential nutrient for humans.

A Scientist Thinks She Has Discovered an Essential Nutrient for Humans,because