Instead of identifying the overall similarities and differences between organisms in the Linnaean classification, the evolutionary classification study the evolutionary line and relationships between organisms to classify them into larger categories or clades.

A clade is defined as the group of species that evolved from a single common ancestor and its descendants. A clade is usually illustrated in a cladogram, which is a drawing that shows all the evolutionary relationships among species. It also shows how evolutionary lineages split from common ancestors.

Scientists use DNA sequences in classification by comparing the genetic information between two species. If the genetic characters of two species are more similar, they recently shared a common ancestor; hence, they are more closely related.

The tree of life shows the evolutionary relationships among the major groups of organisms that are included in the three domains of life. The concept of Charles Darwin regarding the descent with modification was the core of this classification. This structure does not only show hypotheses on how modern organisms have evolved over time but it is also a great reminder that life is a natural process that is always changing. This is the reason why scientists often change the way the organisms are grouped as soon as they gather more evidence.

The answer is yes. It recognizes a monophyletic taxon, which means that all the living species in the family Camelidae have evolved from a single common ancestor. The camelid ancestor in this family and all its living and extinct descendants are included in a clade called Cetartiodactyla.

The genome of a platypus have similarities with reptiles, birds, and mammals; hence, we can say that it is an odd mammal that is considered as part-reptile and part-bird. However, platypus are likely to share more similarities with beavers than with birds since they are both members of the class Mammalia.