If one says that the clearance value of glucose is zero, what does this mean?

What best describes lactic acid fermentation?

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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