when plants make their own food, what type of gas is needed for this process?
a. carbon dioxide
b. oxygen( ? i think this is it? )
c. hydrogen
d. nitrogen

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

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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.