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What can result in speciation within a few generations?
Shelled Arthropod
Arthropods that have an external skeleton or shell, such as crustaceans and certain insects, providing protection and support.
Fossil
Physical evidence of an organism that lived in the ancient past.
Cambrian Period
A geological era around 541 million years ago, marked by a rapid diversification of life forms and the appearance of most major groups of animals in the fossil record.
Great Chain of Being
A hierarchical structure of all matter and life, believed in medieval Christianity to have been decreed by God.
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