This is the gas produced as a result of respiration.

According to my research "when atoms release there energy, sugars produced by chloroplasts get consumed during respiration and then produced a gas." Respiration is the process that living things use to produce energy intake of oxygen and the release of carbon dioxide.

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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.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project