The process of excretion begins with which structure? a. urethra b. ureters c. kidneys d. bladder

The deserts of the sahara and australia are associated with

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

All other things being equal the size of a population will decrease if