What different criteria would you choose to classify people that you meet often?

Based on the sources provided and our conversation history, the sources focus on the scientific classification of **living organisms**. They describe how organisms are grouped into categories like species, genus, family, order, class, phylum/division, and kingdom based on various biological characteristics and evolutionary relationships.

The sources **do not provide criteria** for classifying individual people that you meet often based on everyday characteristics such as personality, appearance, profession, or social groups.

The classification discussed in the sources is a formal, scientific process (taxonomy and systematics) used to facilitate the study and understanding of the immense **diversity of life forms** on Earth. Criteria for this scientific classification include external and internal structure, cell structure, development process, and ecological information, as well as evolutionary relationships between organisms. These are distinct from criteria one might use for social classification of individuals.

Therefore, the sources do not contain information relevant to your query about how to classify people you meet often using everyday criteria.