White blood cells left in the body after an infection that protect against future infection are called select one: a. cells b. xy cells c. b cells d. memory cells

2%? i tried finding the exact sorry if it's not 100% correct ; -;

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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.