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26 terms

Mastering Biology Ch. 25

Dr. Wiens
STUDY
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Reptiles first appeared during the _____ era.
Paleozoic
We are living during the _____era.
Cenozoic
Dinosaurs went extinct during the _____.
Mesozoic
_____ were the dominant vertebrate life form during the Paleozoic era.
Amphibians
Life arose during the _____.
Precambrian
Flowering plants first appeared during the _____.
Mesozoic
The Mesozoic era began approximately _____ million years ago.
251
The Precambrian time began at least _____ million years ago.
4,600
Seed plants first appeared during the _____
Paleozoic
The first prokaryotic cells appeared during the _____.
Precambrian
Animals first appeared during the _____.
Precambrian
The Cenozoic era began approximately _____ million years ago.
65
_____ were the dominant vertebrate life form during the Mesozoic era
Dinosaurs
Most modern animal phyla evolved during the _____ era.
Paleozoic
Bony fish first evolved during the _____ .
Paleozoic
How long ago do scientists believe life first began on Earth?
3.7 billion years
What process produces Earth's atmospheric oxygen?
photosynthesis
What evidence points to the date of the appearance of the first oxygen-producing organisms?
iron oxides in rock
The red sedimentary rocks of Western Australia resulted from the combination of oxygen and _____.
iron
Achaeans can tolerate which of the following extreme habitats?
near-boiling water
high pressure
very salty water
oxygen-free environments
Most scientists support the hypothesis that the Cretaceous mass extinction was caused by _____.
the impact of a large meteor
Why were the scientists in the video studying fossil leaves?
Plant anatomy is a good indicator of the climate.
What evidence do scientists use to support the meteorite impact hypothesis?
A global layer of iridium has been dated to about the same time as the mass extinction.
Why do scientists think that the iridium layer is evidence of meteorite impact?
Iridium is rare on earth and common in meteorites.
Scientists believe that a meteorite struck _____, leading to the extinction of dinosaurs
Yucatan, Mexico
How long ago did the dinosaurs go extinct?
65 million years