Video: DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing. Learn the language of nucleotides as we look at the nitrogenous bases adenine, guanine, cytosine and thymine.
A Respiration by animals CO2 is being added.
B trees burning same
C tree leaves removed
D oil added
The coronary arteries supply oxygen to The heart muscle