"the insect is responsible for preventing water loss by evaporation form the body surface."

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

9. the history of life on earth is recorded in

Some substances but not other can cross the (blank) membrane of a cell