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Unformatted text preview: subsequently was lost in evolution is difficult. Thus, these uncertainties called for several criteria in the determination of evolutionary relationships. The most reliable criteria can be found through examination of molecular characteristics or, more specifically, the comparison of DNA homologous base pairs between organisms. The DNA comparisons show that a common ancestor of all organisms would be a bacteria-like cell, which had DNA for replication and a system that allowed metabolism. After time, multicellularity occurred with the rise of the eukaryotic cell as the Cambrian period allowed for growth. Genome research also indicates that, humans differ from chimps by only about one percent of the bases. Therefore, molecular biology could be successfully used to amount for evolutionary relationships....
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This note was uploaded on 12/01/2010 for the course BIOS 140 taught by Professor Webster during the Spring '08 term at DeVry Austin.
- Spring '08