Minerals do NOT A. have unique crystal structures.
B. have definite chemical compositions.
C. form as the result of natural processes.
D. form as the result of compaction and cementation.

D. form as the result of compaction and cementation.

Explanation:

A. B. and C. are correct therefore leaving D as your answer.

All minerals are unique, all minerals form naturally, and have chemical compositions.

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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.