Single-celled bacteria and multicellular animals differ from one another in a wide variety of ways. How does molecular biology provide evidence for the evolutionary relationship between these two large groups of organisms?
A. Differences in the use of DNA, RNA, and the genetic code show that the groups lacked a common ancestor.
B. The identical use of DNA, RNA, and the genetic code show that the groups evolved from an ancient common ancestor.
C. Differences in the use of DNA, RNA, and the genetic code show that the groups evolved at different rates in different environments.
D. The identical use of DNA, RNA, and the genetic code show that the groups evolved in a pattern of coevolution.
