If a child has two genes for blonde hair (one from each parent), his genotype is said to be

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

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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.