Ch 4: Geologic Time
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| species | Group of organisms that only reproduce with members of their own group
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| cyanobacteria | Earliest form of life. Blue-green algae that photosynthesized.
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| gymnosperm | Plants that produce seeds but not flowers.
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| angiosperm | Plants that have flowers
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| geologic time scale | Divisions of earth's history into time units
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| trilobite | Index fossil that has three lobes, and a segmented body
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| pangaea | large, ancient landmass that contained all continents. Formed in the Paleozoic and broke up in the Mesozoic.
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| Cenozoic | Era of recent life. Began 66 million years ago.
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| Paleozoic | Era of ancient life; dominated by fish and ended with a great mass extinction
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| Precambrian | Longest time of earth's history. Lasted nearly 4 billion years.
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| Mesozoic | Era of middle life. Pangaea broke apart, dominated by reptiles & dinosaurs.
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| organic evolution | Changes of organisms over time
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| eon | longest subdivision of geologic time
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| era | second longest subdivision of geologic time, based on worldwide fossil changes.
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| period | These subdivisions are divided into epochs
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| epoch | smallest division of geo time.
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| natural selection | Process by which only the organism that are suited for an environment will survive. "Survival of the fittest"
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Created by:
brechbillc
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