Humans and non-avian dinosaurs co-existed for a short amount of time.
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Q41: Periods are the longest time spans on
Q42: Fossils became common starting with the Cambrian.
Q43: Atmospheric oxygen greatly increased during the Cambrian.
Q44: Paleontologists have examined the fossil record to
Q45: Humans have existed on Earth longer than
Q47: The Age of Mammals followed the K-T
Q48: A single ocean existed when Pangaea formed.
Q49: The only geologic event known to correlate
Q50: Radioactive isotope dating techniques are usually used
Q51: Early calculations for the age of the
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