Which term refers to the branch of biology that studies patterns of variation and relationships among organisms?

• A. Cladogram
• B. Systematics
• C. Cladistics
• D. Speciation

Answer: (B)

Systematics focuses on how organisms vary and how they are related. It is the field that brings together taxonomy, which is naming and classifying organisms, with phylogenetics, which asks how different groups are connected through common ancestry. This allows scientists to organize biodiversity in a way that reflects evolutionary history, recognizing patterns of variation across lineages and how those variations inform relationships. Cladistics is a method used within systematics to infer relationships based on shared derived traits, and a cladogram is the tree diagram that represents those relationships. Speciation, on the other hand, is the process by which new species arise. While both topics are studied within the broader domain, the branch that specifically studies variation patterns and relationships among organisms is systematics.