Afarmer observed that an increase in the nitrogen content of the soil in a field was followed by an increase in producer productivity. what does this observation most likely indicate about the relationship between nitrogen and the producers in the field? 1points a nitrogen was a biotic factor. b nitrogen was a limiting factor. c nitrogen became a surplus resource. d nitrogen became a selection pressure.

Nitrogen was a limiting factor

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.