What is UTR in biology?

How can you approximate the number of calories required to keep you in energy balance?

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

Individuals do not compete directly for resources, but are prey for the same predator