Which d these statements is true about the oxygen revolution? a- cyanobacteria were the first organisms to introduce oxygen into the atmosphere. b- protocells were the first organisms to produce oxygen in water, which then escaped into the atmosphere. c- cyanobacteria were the first organisms to produce oxygen in water, which then escaped into the atmosphere.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

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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.