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Chapter 32 Introduction to Animal Evolution

Chapter 32 Introduction to Animal Evolution. Chapter 32 Introduction to Animal Evolution. What is an animal?. Chapter 32 Introduction to Animal Evolution. What is an animal?. multicellular. Chapter 32 Introduction to Animal Evolution. What is an animal?. multicellular. heterotrophic.

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Chapter 32 Introduction to Animal Evolution

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  1. Chapter 32Introduction to Animal Evolution

  2. Chapter 32Introduction to Animal Evolution What is an animal?

  3. Chapter 32Introduction to Animal Evolution What is an animal? multicellular

  4. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic

  5. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes

  6. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food

  7. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food no cell walls

  8. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue

  9. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue

  10. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage

  11. Chapter 32Introduction to Animal Evolution What is an animal? multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage

  12. What is an animal? Chapter 32Introduction to Animal Evolution multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage embryonic tissue layers

  13. What is an animal? Chapter 32Introduction to Animal Evolution multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage embryonic tissue layers Hox genes

  14. What is an animal? Chapter 32Introduction to Animal Evolution multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage embryonic tissue layers Hox genes

  15. What is an animal? Chapter 32Introduction to Animal Evolution multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage embryonic tissue layers Hox genes Animals probably evolved from a colonial, flagellated protist.

  16. What is an animal? Chapter 32Introduction to Animal Evolution multicellular heterotrophic eukaryotes ingest their food no cell walls nervous tissue muscle tissue blastula stage gastrula stage embryonic tissue layers Hox genes Animals probably evolved from a colonial, flagellated protist.

  17. Chapter 32Introduction to Animal Evolution

  18. Phylogenetic trees are always being revised. Chapter 32Introduction to Animal Evolution

  19. Science is different from other ways of knowing. Even our most cherished ideas in science are probationary. Ideas can be falsified through experiments or observation. The more testing a hypothesis withstands, the more credible it is. It’s all about the evidence. Chapter 32Introduction to Animal Evolution

  20. The old system: Chapter 32Introduction to Animal Evolution Ancestral colonial choanoflagellate

  21. The old system: Chapter 32Introduction to Animal Evolution No true tissues True tissues Ancestral colonial choanoflagellate

  22. The old system: Chapter 32Introduction to Animal Evolution No true tissues True tissues Ancestral colonial choanoflagellate

  23. The old system: Chapter 32Introduction to Animal Evolution Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  24. The old system: Chapter 32Introduction to Animal Evolution Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  25. Chapter 32Introduction to Animal Evolution Bilateral symmetry

  26. The old system: Chapter 32Introduction to Animal Evolution No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  27. The old system: Chapter 32Introduction to Animal Evolution No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  28. Chapter 32Introduction to Animal Evolution Body cavity Bilateral symmetry

  29. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  30. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  31. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  32. Chapter 32Introduction to Animal Evolution Protostome Body cavity Bilateral symmetry

  33. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  34. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Each of the four main branches divides the tree into grades based on body plan. Radial symmetry Bilateral symmetry No true tissues True tissues Ancestral colonial choanoflagellate

  35. The old system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry Molecular evidence has rearranged the branches. No true tissues True tissues Ancestral colonial choanoflagellate

  36. The new system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome No body cavity Body cavity Radial symmetry Bilateral symmetry Molecular evidence has rearranged the branches. No true tissues True tissues Ancestral colonial choanoflagellate

  37. The new system: Chapter 32Introduction to Animal Evolution Protostome Deuterostome Radial symmetry Bilateral symmetry Molecular evidence has rearranged the branches. No true tissues True tissues Ancestral colonial choanoflagellate

  38. The new system: Chapter 32Introduction to Animal Evolution Deuterostome Protostome Radial symmetry Bilateral symmetry Molecular evidence has rearranged the branches. No true tissues True tissues Ancestral colonial choanoflagellate

  39. The new system: Chapter 32Introduction to Animal Evolution Ecdysozoa Lophotrochozoa Deuterostome Protostome Radial symmetry Bilateral symmetry Molecular evidence has rearranged the branches. No true tissues True tissues Ancestral colonial choanoflagellate

  40. Most animal phyla originated in the “Cambrian explosion” between 525 million and 565 million years ago. Chapter 32Introduction to Animal Evolution

  41. Most animal phyla originated in the “Cambrian explosion” between 525 million and 565 million years ago. Evolution was so fast during that period that it is difficult to sort out the history. Chapter 32Introduction to Animal Evolution

  42. Causes of the Cambrian explosion: Chapter 32Introduction to Animal Evolution

  43. Causes of the Cambrian explosion: Ecological: Chapter 32Introduction to Animal Evolution

  44. Causes of the Cambrian explosion Ecological: The development of predator-prey relationships Chapter 32Introduction to Animal Evolution

  45. Causes of the Cambrian explosion Ecological: The development of predator-prey relationships Geological: Chapter 32Introduction to Animal Evolution

  46. Causes of the Cambrian explosion Ecological: The development of predator-prey relationships Geological: Increasing levels of atmospheric oxygen Chapter 32Introduction to Animal Evolution

  47. Causes of the Cambrian explosion Ecological: The development of predator-prey relationships Geological: Increasing levels of atmospheric oxygen Genetic: Chapter 32Introduction to Animal Evolution

  48. Causes of the Cambrian explosion Ecological: The development of predator-prey relationships Geological: Increasing levels of atmospheric oxygen Genetic: Changes in the Hox genes which control embryonic development. Chapter 32Introduction to Animal Evolution

  49. “Evo-devo” Chapter 32Introduction to Animal Evolution

  50. “Evo-devo” Chapter 32Introduction to Animal Evolution

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