Biological classification

Dec 26, 2010 English 1st Paragraph

Biological classification is how biologists group and categorise extinct and living species of organisms. It is based upon scientific evidence. That evidence comes from two main sources: comparative anatomy (including the anatomy of fossils), and molecular evolution (sequence analysis)…

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• classify, categorise: to study some things and put them in groups based on their similarities and differences
• If something is extinct, it no longer exists. For example, dinosaurs are extinct.
• Sequence analysis means studying the internal sequence (or order) of DNA molecules. Information from sequence analysis is used in many fields of biology. It gives information on the relationship between individual organisms, or between groups of organisms. It shows how closely related they are.