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