Are blue stars young or old how can you tell

The color blue means that the star is the hottest. Also, the smaller a star is the farther away from earth it is.

Explanation: For example, when you look at a candle and see the blue at the bottom, that means that it is the hottest. In comparison to stars, the color blue always means that it is the hottest.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

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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.