Theres an old man needed your help but you are soo late in your work. What would you do?explain it briefly.

Four types of motile cells in human body?

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

About __ of the mass of the cell is water