How has malaria affected the economic in Cambodia

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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

Nh3 +02-no + h20 is unbalanced what is the balanced equation