3. which of the following must occur in order for speciation to take place?

populations within a species must be re-productively isolated.
populations within a species must be geographically isolated.
populations within a species must be behaviorally isolated.
populations within a species must be temporally isolated

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:

i think it is dna, i'm not totally sure but i think it might be.