Diversity increases by 12 bya prokaryotic cell

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Diversity increases by 1.2 Bya
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Prokaryotic cell Eukaryotic cell Eukaryotes’r’us and also all animals, all plants, all fungi, and all microbes with a nucleus.
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Eukarya Larger cells, almost all do aerobic respiration Mitochondria - can do aerobic respiration when O 2 is 2% of Chloroplasts - can do photosynthesis when O 2 is 10% of modern level 2.7 Bya: Sterols in rocks - 1 st evidence of cell walls like Eukarya 2.1-1.7 Bya: Large fossils - Grypania . Almost certainly a eukaryote 1.7-1.2 Bya: Common fossils larger than 60 microns. Low diversity communities 1.2-0.7 Bya: Diverse unicellular eukarya. Invention of SEXUAL REPRODUCTION
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~1.7 Ga: oldest multicellular fossils
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THE EDIACARAN FAUNA 600 Ma -544 Ma
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Vendian - late Pre-Cambrian
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PHANEROZOIC LIFE: The Cambrian Explosion
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PHANEROZOIC PATTERNS: “Ages”
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PHANEROZOIC PATTERNS: Mass Extinctions
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Complex Life Record Low diversity of life in Pre-Cambrian (prior to 544 Mya) and low rock preservation gives little time resolution based on fossils, must use radioactive decay to date Cambrian explosion and after has great diversification of life and attendant extinction. Distinct flora and fauna succeed one another, providing a relative sequence of rock age based on history of life.
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PART 4: THE BURGESS SHALE FAUNA
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Small shelly fauna
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PART 5: VERTEBRATES! Conodont “Ostracoderm” Earliest (jawless) fish Early Cambrian Late Cambrian
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Ordovician - corals, trilobites, snails, brachiopods
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Silurian: corals, cephalopods, jawless fish, first land flora
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