Which of the following facts are true about ground level ozone? a. O3 and primary pollutant
b. O3 and secondary pollutant
c. O2 and primary pollutant

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:

not sure if this is what you'r looking for nnew= nold