1.

Which of the following is a unit of net productivity?

A. Production of C/g/m<sup>2</sup>/day
B. g<sup>-2</sup> or kcal m<sup>-2</sup>
C. g<sup>-2</sup> yr<sup>-1</sup>
D. kcal m<sup>-2</sup> yr<sup>-1</sup>
Answer» B. g<sup>-2</sup> or kcal m<sup>-2</sup>


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