What does the process of natural selection involve? preservation of disadvantageous genetic mutations preservation of advantageous genetic mutations preservation of all species preservation of all members of a species

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