What does cell specialization allow cells to do?

What type of lipids are found in all biological membranes?

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

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