The respiratory advantage provided by a four-chambered heart over a three-chambered heart in vertebrates is:

This arrangements enabled the left and right ventricles of the heart to mix the blood with oxygen.The mixing reduced oxygenation efficiency : SO THAT HIGH PRESSURE IN THE VENTRICLES ,AND VESSELS(pulmonary) pushes blood saturated with CO2 to the Lungs and through the AORTA Oxygen saturated blood into the systemic circulation.

Oxygenation efficiency is the maximum amount of oxygen that the body can consume.Oxygenation is the addition of oxygen to the body of organisms.

Explanation:

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

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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.