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During which geological era did the Cambrian Explosion occur?
During which geological era did the Cambrian Explosion occur?
What possible environmental conditions contributed to the Cambrian Explosion?
What possible environmental conditions contributed to the Cambrian Explosion?
Which type of organisms resulted from the Cambrian Explosion?
Which type of organisms resulted from the Cambrian Explosion?
What was the adaptive advantage of hard-bodied animals during the Cambrian Explosion?
What was the adaptive advantage of hard-bodied animals during the Cambrian Explosion?
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Which group of animals are considered the ancestors of insects, spiders, and crustaceans?
Which group of animals are considered the ancestors of insects, spiders, and crustaceans?
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What is the most recent eon in the geological time scale?
What is the most recent eon in the geological time scale?
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How many periods is the Paleozoic era divided into?
How many periods is the Paleozoic era divided into?
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What was a result of the increase in oxygen levels in the atmosphere during the Cambrian Explosion?
What was a result of the increase in oxygen levels in the atmosphere during the Cambrian Explosion?
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What was a characteristic of brachiopods that evolved during the Cambrian Explosion?
What was a characteristic of brachiopods that evolved during the Cambrian Explosion?
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What was a benefit of having a hard-bodied shell during the Cambrian Explosion?
What was a benefit of having a hard-bodied shell during the Cambrian Explosion?
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