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23 Cards in this Set
- Front
- Back
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Geologic time is divided into units based upon types of
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fossils (organisms)
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The longest subdivision in geologic time is a(n)
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eon
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A life-form in the Precambrian time was
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cyanobacteria
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Life-forms that existed during the Paleozoic Era are
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fish, trilobites, reptiles
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Homo sapiens probably appeared ________ years ago.
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400,000
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Changes in the environment can result in
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changes in species
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A life-form that evolved during the ____ Era was the dinosaur.
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Mesozoic
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Plate tectonics may affect organic evolution because movement of plates may cause a change in __________.
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the environment
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The divison of Earth's history into smaller units makes up the ___________.
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geologic time scale
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Reptiles evolved from an ancestor of amphibians that developed a(n)
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egg with a strong outer shell that kept it from drying out
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A ____________ is a group of organisms that only reproduces with other members of their group.
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species
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This supercontinent formed at the end of the ______________ Era.
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Palezoic
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The northern part of Pangaea was called _________________.
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Gondwanaland
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The southern part of Pangaea was called ________________.
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Laurasia
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Animals with pouches are called
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Marsupials
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Flowering plants are called
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angiosperms
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Most life-forms of the Palezoic Era lived in ______________.
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oceans/water
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The _______________ formed during the Paleozoic Era.
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Appalachian Mountains.
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Humans first appeared during the _________ Era.
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Cenozioc
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Pangaea seperated into __________.
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two large landmasses
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Scientist believe dinosaurs evolved from ___________ during the Mesozoic Era.
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reptiles
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______ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils.
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Eras
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____________________ proposed the theory of natural selection.
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Charles Darwin
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