Humic substances consist of ________.
A) dead plant & animal tissues
B) living organisms and cells
C) polymerized, non-identifiable molecules
D) identifiable biomolecules
E) all of the above
Question 2
After drying to eliminate the water in plant litter, which two elements account for about 80 of the dry weight?
A) Ca and C B) N and S C) C and H D) N and C E) C and O