Productivity is the rate of production of biomass expressed in
(i) kcal m-3 yr-1
(ii) gm-2 yr-1
(iii) g-1 yr-1
(iv) kcal m-2 yr-1
1. (ii)
2. (iii)
3. (ii) and (iv)
4. (i) and (iii)
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