The beginning of the Cambrian period marks an important event in animal evolution - the appearance of organisms with ________.

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Biology

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The beginning of the Cambrian period marks an important event in animal evolution - the appearance of organisms with ________.

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The beginning of the Cambrian Period is marked by the evolution of hard body parts such as calcium carbonate shells. These body parts fossilize more easily than soft tissues, and thus the fossil record becomes much more complete after their appearance.

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