8. A classmate named Brandon is arguing that if the universe had expanded more slowly than it did, the
transition from an opaque to a transparent universe would have happened sooner than it actually did.
How would you explain to Brandon, using the formation of the first elements in the universe, that he is
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what do the different brain waves do?
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.
blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.