Suppose an alien life form is discovered on another planet that takes in ch4 from the atmosphere which of the following could be used to determine what happens if ch4 after the organism consumes it

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