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.


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