Analyze the graph below from NASA showing carbon dioxide concentrations for the last 800,000 years. Why is studying past climate changes and their impacts such as the impacts from the rapid warming event of the Paleocene-Eocene Thermal Maximum (PETM) so important today? Hint: The PETM lasted more than 150,000 years until the excess carbon was reabsorbed.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

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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.