What is the process of grouping things based on their similarities?

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

What is the role of the phospholipid belayer in cellular transport in living cells

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?