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15 Cards in this Set
- Front
- Back
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stromatolites
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banded layers of sediments (limestone) containing bacterial mats
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cyanobacteria
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photosynthetic bacteria, caused a turnover in the atmosphere to oxygen approx. 2 billion years ago
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endosymbiotic theory
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Major organelles (mitochondria) produced by symbiotic relationship with a prokaryotic cell
protoeukaryote endocytosed a prokaryote cell (the symbiont) |
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Origin of first animals
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soft bodied marine invertebrates about 700 mya
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Doushantuo fossils (southern china)
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sponges, animal embryos, cyanobacteria, and multi-cellular algae
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Edicaran fossils (Southern Australia)
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large sponges, jellyfish, burrows, tracks, NO shells
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colonization of land occurred aprox
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500 mya
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Abundant fossil record appears in the
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beginning of the Palezoic period
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Cambrian explosion
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adaptive radiation
appearance of hard shells and exoskeletons all phyla existing today appeared |
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trilobites
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marine arthopods abundant during the Paleozoic
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Major problems in moving to land
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UV radiation
Reproduction water retention |
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Poikilohydric
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Plants whose water content matched that of hte surrounding environment (desiccation tolerant)
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At the end of the Permian,
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mass extinction (mostly marine, trilobites)
Pangaea forms sea levels reduced volcanic activity |
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At the end of the Permian,
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mass extinction (mostly marine, trilobites)
Pangaea forms sea levels reduced volcanic activity |
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At the end of the Permian,
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mass extinction (mostly marine, trilobites)
Pangaea forms sea levels reduced volcanic activity |
