Answer:
The correct answer would be the second option which states that classification can change with new discoveries and evidence.
A phylogenetic tree is a diagrammatic representation in the form of a tree which represents the evolutionary relationships of various species.
It helps in developing phylogeny or classification of species based on the similarities as well as differences in their physical as well as genetic characteristics.
New discoveries and evidence can change the classification or phylogeny.
For example, when duck, platypus, and opossum were compared on the basis of physical characteristics only, the shape of the phylogenetic tree obtained was different than that of obtained when they were compared on the basis of structure, genetics, and evolutionary history.
The earlier tree showed that all they were not related to each other. In contrast, the second tree showed that opossum and platypus were more related to each other as compared to the relatedness of opossum and duck. In addition, opossum and platypus evolved from the common ancestor.
