Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
A single fundamental similarity and or unity among all living organisms, is that all living organisms are composed of the basic units is life known as cells.
B is shown in the diagram
A common ancestor
Lol i just finished this unit a month ago
