In wich object dose the solar systyem conform as the coldest place in the wold

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

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

The transport tubes for food coming down the plants are called?