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10 Cards in this Set
- Front
- Back
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Scientists that use fossils to recon-struck the history of life before humans existed |
Paleontologists |
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The particles that make up matter. |
Atoms |
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The divisions characterized by the type of organism that dominated earth at the time |
Eras |
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The Mesozoic era - dominated by dinosaurs and other reptiles- is referred to as the |
Age Of Reptiles |
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These periods when many species suddenly become extinct are called |
Mass Extinction |
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Wegener called that single landmass ___________, which means "all earth" |
Pangea |
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Each huge piece of crust is called a |
Tectonic plate |
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These organisms were ______________ , or single-celled organisms that lack a nucleus |
Prokaryotes |
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There is evidence that ____________________ , a new kind of prokaryotic organism, appeared more than 3 billion years ago |
Cyanobacteria |
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This gas, called ________ , absorbs harmful radiation from the sun |
Ozone |
