The saying "Don’t judge a book by its cover." could be applied to the topic of evolution. For example, humans share 75% of their DNA with chickens. Biologists point to this as evidence that humans and chickens once shared a common ancestor. The advent of DNA technology has given scientists the tools with which to examine how closely related certain species are. DNA analysis allows scientists to construct phylogenetic trees whose branches link together the relatedness of different organisms.

The DNA analysis is very important in evolutionary biology because the level of homology among sequences can be used for tracing the evolutionary relationships among populations, species, genera, families, orders, etc.

Explanation:

The DNA is key for phylogenetic inference because the order of the nucleotide bases in a DNA sequence enables to classify the biodiversity in the tree of life

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.