Which of the following true?
a. chemical bonds are repulsive forces between the atoms of molecules
b. the most reactive atoms already have 8 valence electrons
c. atoms tend to react so that they acquire 8 electrons in their outermost shell

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

Which characteristics are typical of a human population in the postindustrial stage?

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast