What is one biotic factor that can change the size of a population in an ecosystem?

a) the type of soil present

b) the number of predators present

c) the average yearly temperature

d) the amount of available groundwater

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