SC.7.N.1.4 10. Which scientific investigation does not include Dependent (outcome) and
Independent (test) variables?
A) counting bird populations I
B) studying the effect of temperature on bacterial reproduction rates
C) investigating the effect of mass on the speed at which an object falls
D) testing a model car in a wind tunnel to minimize air flow resistance and maximize
fuel economy

hope it mark me as brainlieast.

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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.

c should be the answer