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History of Life Part 3. Proterozoic Eon 2.5 bya – 543 mya stable continents first appear Most life are Bacteria and Archaeans first evidence of oxygen.

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Presentation on theme: "History of Life Part 3. Proterozoic Eon 2.5 bya – 543 mya stable continents first appear Most life are Bacteria and Archaeans first evidence of oxygen."— Presentation transcript:

1 History of Life Part 3

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3 Proterozoic Eon 2.5 bya – 543 mya stable continents first appear Most life are Bacteria and Archaeans first evidence of oxygen build-up in the atmosphere This global catastrophe spelled doom for many bacterial groups & made possible the explosion of eukaryotic forms.

4 Endosymbiosis What does it mean? The rise of Eukarya 1.8 bya Endo = within sym = together biosis = life Endosymbiosis = organisms of a different species living together, with one of the organisms living within the other Symbiosis between different species of eubacteria & between archeabacteria and eubacteria

5 Prokaryotes lead to Eukaryotes

6 Endosymbiosis Increases Organism Complexity

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8 Croanoflagelado: -last unicellular ancestor of all eukaryotes -Characteristics similar to modern protista

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10 800 mya: 1st-multicellular organism Sphaeroeca, a colony of choanoflagellates ~230 individuals cooperatively linked protists

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12 850 MYA First Fungi the fossil on right are fungal filaments resemble living filaments of common Candida species. the fossil at right has preserved the perithecium with spores used for reproduction. Amber fossils

13 760 MYA-First Animal Otavia antiqua -a sea spongue

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15 Typical day in a late PreCambrian sea…

16 Trilobites : the 1 st exoskeletons.

17 Finally the ocean is full of animals with hard parts… by the early Paleozoic there are lots of animals that can form fossils. Cambrian Explosion: ~570mya- 500mya

18 Cambrian Explosion : A sudden explosion of complex, multicellular life at the beginning of the Paleozoic Many of these early animals looked very strange, unlike any animals we find on Earth today.

19 Opibinia … 1 st macroscopic predator

20 Most of the major phyla originated over several million years during the early Paleozoic…

21 520 mya Pikaia: 1 st Chordate

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23 Typical day in late PreCambrian sea…

24 Jawless Fish Earliest Fish 500 mya

25 Armored Fish

26 Lobed Finned Fish

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28 Plants Move Onto Land

29 480 MYA- First Land Plant The cryptospores are the oldest land plant fossils found. Petrified fossils

30 Animals Move Onto Land

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33 Fish to Amphibian

34 Tiktaalik: fish-amphibian transition fossil 370 mya: Amphibians

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36 ~310 mya 1 st REPTILES first animals with backbones able to live on dry land Ex Thecodont

37 Earliest Dinosaur Eoraptor 230 mya Argentina 3 ft long 10 lbs Carnivor Bipedial dawn theif

38 How is a dinosaur different from a reptile?

39 Flying Reptiles Appeared ~ 230mya, around the same time as dinosaurs. They were the first vertebrates to fly.

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42 Georgia Eoraptor site

43 Reptiles to Mammals

44 Earliest Mammal Megazostrodon found in Africa ~ 220 mya 4-5 inches long Carnivore Laid eggs mega-large, zostros-girdle odon-tooth

45 Reptiles to Birds

46 Feathers ?… most small theropod dinosaurs were covered in feathers.

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49 Earliest Bird Archaeopteryx Ancient wing ~150 mya

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51 The late Cretaceous was a time of intense volcanic activity. For many millions of years the atmosphere was modified by the release of volcanic gases and ash.

52 Major Extinction Event 65 mya 65% all species become extinct, including all non-avian dinosaurs Worse for large animals Marked the end of the Mesozoic

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54 Impact at Chixulub in Yuccatan Peninsula

55 Post Ice Age: Large Mammals Ground Sloth: 20 mya

56 175,000 yr ago- Homo sapiens 1.8 MYA- Home erectus first to travel long distances & use fire 2.5 MYA- Homo habilis First tool user 3.9 MYA- Australopithecus afarensis First bipedalism

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