Cladograms represent the relationship and the common ancestry between the organisms. Green algae are the most common ancestor that shares the lineage. Thus, option 1 is correct.
A cladogram is a graphical representation of the organisms and various species that shares similar lineages and common ancestry. The green algae share a common ancestor as it is closest to the lineage branching that shares the most common features and traits.
Therefore, green algae have a common ancestor.
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