A scientist was testing the accuracy or Chargail's rule. She noticed that a DNA molecule contains 40% adenine, what are the percentages of each of the other nitrogenous bases?
A. 20% cytosine, 20% adenine, 20%guanine
B.20thymine, 40% guanine, 40% cytosine
C. 40% thymine, 10% guanine, 10% cytosine
D. 40% uradil, 10% guanine, 10% cytosine

Which statement best describes the nature of science? a. science discoveries using the latest technology are the most valuable. b. scientific theories and laws are based on beliefs and popular opinion. c. scientific ideas change over time as new information is discovered. d. science is superior to other fields such as art, philosophy, and music. i think its c

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What best explains the inability for life to exist in earth early atmosphere