______________ is a major factor in determining the methane yield and methane production rates from the digestion of biomass.

______________ is a major factor in determining the methane yield and

1.	______________ is a major factor in determining the methane yield and methane production rates from the digestion of biomass.
A.	Seeding
B.	Contamination
C.	Substrate composition
D.	Moisture content
Answer» D. Moisture content