Free 100 I am thank full for people who answer questions

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 the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center