Identify the biotic factor of an ecosystem from the following

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

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

What drives an advertising campaign?