. The sodium-potassium pump is involved in active transport that moves 3 sodium ions from the cell for every 2 potassium ions it moves into the cell. Which of these best explains why energy is needed for active transport?

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