Please give me good luck I have a sciene test and I am not good at science

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

Explain why the plants cortex would serve as the best food source for animals

What is the difference between a scientific hypotheses and a scientific theory?