Is capillaries bigger or smaller than veins?

What is the number of phosphates in an atp molecule

Are the earth's ocean floor and continents the same age geologically? why or why not?

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is 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