Which of the following is a characteristic of a weak acid? O A. It is not as dangerous as a strong acid.
O B. It is less concentrated than a strong acid.
O c. It does not dissociate completely in water.
O D. It does not conduct electricity in water.

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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 .