Which of the following is a complementary base pair ? A . guanine - thymine
B . guanine - guanine
C . adenine - cytosine
D . guanine - cytosine

Which image shows labeled organelles that are present only in plant cells?

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

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