Question 15

(Multiple Choice)

Which six elements are the main components in living organisms?


A)carbon,hydrogen,nitrogen,oxygen,phosphorus,sulfur
B)copper,iron,magnesium,sodium,water,zinc
C)carbon dioxide,hydrogen,nitrogen,oxygen,phosphate,sulfate
D)calcium,hydrogen,iron,potassium,sulfur,water
E)aluminum,magnesium,nitrogen,silicon,sodium,sulfur

Answer