The Sierra Nevadas formed during what Cordilleran orogeny?
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What is a mass extinction?
What is a mass extinction?
During the Paleozoic, three large mass extinctions took plac…
During the Paleozoic, three large mass extinctions took place. They occurred during the:
What percentage of mammals alive today belong to the order R…
What percentage of mammals alive today belong to the order Rodentia?
Sea levels were lower in the Mesozoic than they are today.
Sea levels were lower in the Mesozoic than they are today.
The degree to which detrital particles have had their sharp…
The degree to which detrital particles have had their sharp edges and corners smoothed off by abrasion is ____.
Anthropoids and prosimians both thrived in cold, dry climate…
Anthropoids and prosimians both thrived in cold, dry climates during the Cenozoic.
The richest assemblages of dinosaur fossils formed in the __…
The richest assemblages of dinosaur fossils formed in the __________________ during post-flood deposition.
A nonconformity occurs when:
A nonconformity occurs when:
One evolutionary adaption of hominids was bipedalism, likely…
One evolutionary adaption of hominids was bipedalism, likely in response to environmental changes from forests to savannas.