HELP PLEASE with this question it is for a grade

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

The response is the basis for vaccination. primary secondary tertiary none of the above

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point