The need for energy, gained by respiratory and photosynthesis, is the driving force and the oxygen cycle. true or false?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his 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

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

What changes the stability of the element