SCIENTIFIC INQUIRYINTERPRET THE DATA The feather moss Pleurozium schreberiharbors species of symbiotic nitrogen-fixing bacteria.Scientists studying this moss in northern forests found thatthe percentage of the ground surface “covered” by the mossincreased from about 5% in forests that burned 35 to 41 yearsago to about 70% in forests that burned 170 or more years ago.From mosses growing in these forests, they also obtained thefollowing data on nitrogen fixation: Age(years after fire) N fixation rate[kg N/(ha · yr)] 35 0.001 41 0.005 78 0.08 101 0.3 124 0.9 170 2.0 220 1.3 244 2.1 270 1.6 300 3.0 355 2.3

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Functional Diversity