Sex is not genetically determined in all organisms. do you agree? why?

Yes, because if an organism reproduces asexually,  there is no presence of a 'father' organism. This mean that there is no need for an X or Y chromosome to be given by the father. Since the chromosome given by the father determines the sex of the offspring, if the organism reproduces asexually, there is no determined sex.

A sex-determination system is a biological system that determines the development of sexual ... In many species, sex determination is genetic: males and females have different However, not all species depend upon the W for their sex.

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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.