Why does the presence of lone pairs contribute to the polarity of a water molecule?
A) They allow the bonds between oxygen and hydrogen to be single.
B) They increase the partial positive charge on the oxygen atom.
C) They prevent the atoms from forming a linear molecule.
D) They counter the uneven pull on electrons between the atoms.

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 .

Man i dont know this answer

Ithink that the answer is b