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19.9: History of Life on Earth- Challenge

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    1. Prokaryotes do not have ___.
    membrane-bound organelles or a nucleus
    2. Photosynthesis allowed for the proliferation of life because ___.
    organisms no longer had to rely on nutrients floating by for food
    3. ___ are reef-like structures in which colonies of cyanobacteria lived.
    4. The first humans evolved ___ years ago.
    0.2 million
    5. We are currently living in the ___ era.
    6. The dinosaurs lived in the ___ era.
    7. Most of the fossil fuels we burn today originated from ___swamps, dominated by ___ plants.
    Carboniferous; seed-bearing
    8. The largest increase in the number and diversity of living things on Earth was the ___ at the beginning of the ___ era.
    Cambrian Explosion; Paleozoic
    9. Simple plants lacking vascular tissue, like mosses, began to colonize land during the ___ period.
    10. Homo erectus developed the first ___.
    11. Cultures with control of fire, use of tools, and hunting strategies began to evolve with the appearance of the species ___.
    Homo erectus
    12. Species of the genus Ardipithecus lived in ___.
    13. Phanerozoic means ___.
    visible life
    14. The Quaternary Period marks the time since ___.
    the beginning of the ice ages
    15. "The Recent" is another name for the ___.

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