Please help me with the question in the photo.

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

What best explains the inability for life to exist in earth early atmosphere

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?