Which conclusion do the data support?

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

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?

What are the subsystem of the earth