Who down to talk guys??

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

Identify the structure in organisms that do not have kidneys that is adapted to regulate water balance

On his trip to the galapagos islands, darwin determined that animals on the islands