When a cell prepares to divide, the chromatin condenses into rod-shaped structures called?

Chromosome

Explanation:

As the cells prepare for cell division, several events occur. During the prophase of mitosis, the thin threads of chromatin are condensed into rod-shaped visible structures. The process of compaction of chromatin gives rise to chromosomes. Chromosomes are rod-shaped structures made up of DNA and packaging proteins. Since DNA replication has already occurred during the S phase of interphase, each chromosome has two sister chromatids.

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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.