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Geologists have subdivided geologic time into units based on
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
What is the estimated age of Earth?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
What percentage of Earth's history represents human existence?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
Which life-forms were living on Earth when India was at position A?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
Trilobite fossils were recently discovered in Himalayan Mountain bedrock. During which geologic period could these organisms have lived?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
Which graph shows the relative duration of geologic time for the Precambrian, Paleozoic, Mesozoic, and Cenozoic time intervals?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
Antarctica's location and climate changed over the last 200 million years because Antarctica moved
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
Which number best represents when humans are inferred to have first appeared on Earth?
B
less than 1.0%
4
dinosaurs
southward, resulting in a colder climate
fossil evidence
Cambrian
4.6 × 10^9 years
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