Researchers studying microbial activity at another active oil-spill site found decreasing levels of methane over the course of several months, but no changes in oxygen saturation in any of their repeated samples. How should they interpret these results

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