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The Geologic Time Scale is most appropriately measured in the following units:
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
What is a fossil?
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous Period?
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
Which type of fossil can provide clues about the activities of ancient organisms?
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
A fossil formed when minerals replace all or part of an organism is called a:
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
Fossils of Woolly Mammoths have been discovered in the rock layers of Mexico. Which statement provides the BEST explanation for this discovery?
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
The Geologic Time Scale is a record of
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
Fossils are almost never found in igneous rocks because the organisms that form fossils
Dinosaurs could not adapt to Earth's changing conditions
are destroyed by the heat
the life forms and geologic events in Earth's history
The climate of Mexico has changed over time
trace fossils
Eras and Periods
the preserved remains or traces of an organism
petrified fossil
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