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Evolutionary history of Biological diversity

Evolutionary history of Biological diversity. 2.7 billion yrs ago = oxygen 2.1 billion years ago = eukaryotes 1.7 billion years ago = multicellular euk. 500 million years ago = plants, fungi, animals. Gram staining. Nitrogen fixation. -Eukarytoic -Mostly unicellular -Aerobic.

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Evolutionary history of Biological diversity

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  1. Evolutionary history of Biological diversity

  2. 2.7 billion yrs ago = oxygen • 2.1 billion years ago = eukaryotes • 1.7 billion years ago = multicellular euk. • 500 million years ago = plants, fungi, animals

  3. Gram staining

  4. Nitrogen fixation

  5. -Eukarytoic -Mostly unicellular -Aerobic

  6. Endosymbiotic theory

  7. Green algae  Land Plants • Evidence: • Similar chloroplasts • Cellulose walls • Peroxisomes • sperm

  8. Bryophytes • Mosses/liverworts/ hornworts • Reproduce using spores • Avascular • Gametophyte is dom. stage

  9. Pteridophytes (ie ferns) • Vascular • No flowers or seeds • Use spores • Sporophyte dom. life cycle • Kind of in between bryophytes and angiosperms/gymnosperms

  10. Alternation of generations 2 multicellular stages -gametophyte (haploid) -gametes are produced -sporophyte (diploid) -fertilization of egg by sperm forms sporophyte

  11. Gymnosperms conifer

  12. Angiosperms (flowering) • Monocots • Parallel veins • 1 cotyledon (seed leaf) • Dicots/Eudicots • Netlike veins • 2 cotyledons

  13. Double fertilization

  14. mycelium

  15. lichens

  16. Sponges (parazoa) • Filter feeders

  17. Cnidarians Radial symmetry

  18. Platyhelminthes (flatworms)

  19. Nematoda (round worms)

  20. Molusca

  21. Annelida • Segmented worms

  22. Arthoropoda • Segmented, exoskeleton • bilateral

  23. echinoderm

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