Which of the following pieces of additional data would further investigate the relationship between bears, salmon, and influx of nitrogen into the local environment?
(a) the experimenters should remove the remains of salmon carcasses immediately after the salmon are eaten by the bears and determine the nitrogen content of the carcasses.
(b) the experimenters should increase the number of bears in the area and measure the amount of nitrogen available for uptake by plants.
(c) the experimenters should set up a net to catch salmon before they enter the area and then measure nitrogen influx.
(d) the experimenters should clear-cut the trees from the area and determine how much nitrogen remains in the streams.
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