Phylogenetic system of classification is based on
A) Evolutionary relationships
B) Morphological features
C) Chemical constituents
D) Floral characters

Hint: It can be represented via a diagram known as phylogenetic trees. It reflects how species or other groups evolved from a series of common ancestors. It is very useful to know the similarities between the organisms from shared homologies or separate analogies.

Complete answer:
- After the system of classification is published by Linnaeus, the ideas began to change about classifying organisms, and Darwin's major work on evolution which is written in his book 'On the Origin of Species by Natural Selection' which was published in 1859 incorporating evolutionary history consist of genetic relationships, of the organisms.
- Phylogeny is a group of the evolutionary history of genetically similar organisms composed of ancestor species and descendant species.
- A Phylogenetic tree is a diagram of a tree that usually represents a phylogeny.
- "Darwin's Tree of Life" is an example of a phylogenetic tree in which he was trying to show how evolution generated. How species have evolved is shown with the help of the tree from the bottom to the top. As species evolved, new branches of the tree formed, and some branch into additional descendent species.
- Others went extinct after being dead without any descendent


Additional information:
- Cladistics is the most common method of incorporating information into phylogenetic trees.
- It was developed by Wili Hennig in 1950, it is a very popular type of phylogenetic tree which is even widely used today.
- It comes from the word clade which means cladogram.
- Few or two species included in the small clades video common ancestors and more is species with the common ancestors included in the large clade.
So, the correct answer is "A) Evolutionary relationships".

Note:
- Phylogenetic tree or the phylogeny can be called an evolutionary tree used for determining evolutionary relationships.
- The evolutionary relationship allows scientists to study diseases such as HIV from appropriate organisms.
- It is based on evolutionary ancestry and produces trees called cladograms.