In the context of a silicon-based semiconductor, match each of the following descriptions to the type of semiconductor.
dopant: boron contains electron holes contains extra electrons dopant: phosphorus n-type semiconductors or p-type semiconductors

1.dopant:boron - p-type semiconductors 
2.contains electron holes - p-type semiconductors 
3.contains extra electrons - n-type semiconductors
4.dopant:phosphorus - n-type semiconductors

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The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .