Carbon is released to the atmosphere by

a respiration and burning of fossil fuels and wood
b burning of fossil fuels and photosynthesis
c respiration and fixation
d respiration and photosynthesis

The answer is D. Respiration and photosynthesis

2%? i tried finding the exact sorry if it's not 100% correct ; -;

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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.