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What is the classification system in biology, the taxonomy used to categorize organisms in a structured hierarchy? What are species and individuals in biological and evolutionary contexts, and what is the relationship between them?

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Quayshawn Spencer is the Robert S. Blank Presidential Associate Professor of Philosophy and Undergraduate Chair at the University of Pennsylvania.

Closer To Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.