This rate of reaction can be measured in the dark by determining the amount of oxygen gas consumed in a period of time? A: Primary productivity

B: Gross primary productivity

C: Net primary productivity

D: Cellular respiration

Cellular reaction rate could be assessed in the darkness by measuring the oxygen gas consumption over a certain period.  

Wrong choices can be explained as follows:

Therefore, the final answer is "Option d".

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D: Cellular respiration

Explanation:

Because we work in a sea of oxygen (air is 20.9% oxygen) it is difficult to measure the small changes in oxygen concentration that occured during respiration. The rate of Cellular Respiration can be measured in the dark by determining the amount of oxygen gas consumed in a period of time.

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i think it one of his hm q but he dont understand it i think