Why is the blood that drains into the hepatic portal circulation nutrient-rich

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

Nucleic acid certain protein cell membranes certain carbohydrates

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