7. What would be considered the dependent variable in the above example?
No nitrogen added
Nitrogen added
The researchers added nitrogen fertilizer to one of the plots of marsh grass gathered from
a field. They then observed the measured the growth of the marsh grass in both plots after
a time period of six weeks.

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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.

answer; both surfaces of the membrane are nonpermeable