Saint Bernards and Chihuahuas (two breeds of domestic dogs) cannot mate normally owing to great difference in size. Thus they are reproductively isolated to some extent. What type of isolating mechanism is operating here? * o developmental O postzygotic prezygotic O geographic​

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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.

it is called the mitotic spindle