Which event must take place before meiosis can begin? (a) the division of the cytoplasm
(b)the formation of the gametes
(c)the copying of the chromosomes
(d)the separation of the tetrads

Hello dear ,

your answer is C)

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it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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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.