Molecular clocks
a. take advantage of the fact that all mutations happen at a steady rate.
b. take advantage of known mutation rates to estimate how long ago organisms shared a common ancestor.
c. take advantage of the fact that only neutral mutations do not happen at a steady rate.
d. take advantage of the fact that all mutations affect the fitness of an organism.

thinking it would be physical characteristics

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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.