4. Did the square nose of Species D and Species G come from the common ancestor? 5. Is the square nose of Species D and Species G a homologous structure? 6. Are the cat ears of Species D and Species F homologous structures? 7. Are the smiles of Species E and Species G homologous structures?

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.