What does the pulmonary vein do?
a. brings blood from the liver to the heart
b. brings blood from the heart to the liver
c. brings blood from the heart to the lungs
d. brings blood from the lungs to the heart

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time