Fossils are most valuable in to determine the age of a rock. a. relative b. absolute c. relative or absolute

A. Relative

Explanation:

Fossiles can scienctist a time period but can not give scientist a defenitive date.

answer; /// i do believe its (heredity); good luck

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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.