Organización política del mundo

Which of the following is an oxidation-reduction reaction? (pictured below)

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

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science