Here all you have to do is listen to leonard.I will add a quiz.Enjoy!!!!!!!!!!!! please do not write any disrespectful comments down.ANSWERS TO THE QUIZ BELOW!!!!!!! 1-TWO POLYNEUCLEOTIDE CHAINS 2-A DOUBLE HELIX 3-7 MILLION YEARS 4-WOOLY MAMMOTH 5-65 MILLION YEARS
THANKS EVERYONE