• Classification, or taxonomy, enables organisms to be categorized, either in order to identify them or in order to understand their evolutionary history.
• The diversity of organisms on Earth is a reflection of the process of evolution by natural selection.
• The discovery of homeobox genes has provided an insight into how large scale evolutionary change can potentially happen extremely fast.
• Microevolution describes the origin of new species and macroevolution describes higher level evolution, essentially trends in the fossil record.
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