MCQ
Productivity can be expressed in which of the following forms?
- ✓$g ^2 yr ^1$ or $\left( Kcal m ^2\right) yr ^{-1}$
- B$g ^3 yr ^2$ or $\left( Kcal m ^3\right) yr ^{-1}$
- C$g ^2 yr ^2$ or $\left( Kcal m ^2\right) yr ^{-2}$
- D$g ^2 yr ^{-1}$ or $\left( Kcal m ^3\right) yr ^{+1}$
