Select the choice that best completes the following sentence. When an axe is used to chop wood,

Which element provides strength to the exoskeleton of clams and oysters

Which is an example of a population?

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