A polyphyletic group is a taxonomic collection of organisms that lack a single shared evolutionary origin or common ancestor (e.g., protists).

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Phylogeny is the study of the evolutionary relationships and history of different species of organisms on Earth. Taxonomic classification systems often take these phylogenies into account to organize species based on their evolutionary connections, which can be visually depicted using phylogenetic trees.

Phylogeny

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

A phylogenetic tree, also known as a tree of life, is a branching diagram used to depict the evolutionary relationships among different groups of organisms. In these diagrams, all branches typically originate from a single 'trunk' representing a common ancestor, and organisms are arranged in branching structures based on how closely related they are thought to be.

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