The Following Questions Refer to This Phylogenetic Tree, Depicting the Origins

Multiple Choice

The following questions refer to this phylogenetic tree, depicting the origins of life and of the three domains. Horizontal lines indicate instances of gene or genome transfer.

-Which portion of this tree may ultimately be better depicted as a "ring"?

A) the bacterial lineage
B) the archaean lineage
C) the eukaryotic lineage
D) the weblike part near the base of the tree
E) the part corresponding to the first living cell on Earth