What is represented by the base root of a phylogenetic tree?

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.