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1. |
It is often desirable to define the root of a tree. There are two ways to define the root of a tree. One is to use an outgroup, which ______ |
A. | is a sequence that is homologous to the sequences under consideration |
B. | is separated from those sequences at an early evolutionary time |
C. | is generally determined from independent sources of information |
D. | is generally determined from similar or related sources of information |
Answer» E. | |