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9 milestones in animal evolution

9 milestones in animal evolution. 1. Multicellularity. An organism that has many cells. Example organisms: Sponges. 2. Tissues. A group of specialized cells with a common structure and function. Example: Cnidarians (Jellyfish) (Corals) (Anemones). 3. Bilateral Symmetry.

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9 milestones in animal evolution

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  1. 9 milestones in animal evolution

  2. 1. Multicellularity • An organism that has many cells. • Example organisms: Sponges

  3. 2. Tissues • A group of specialized cells with a common structure and function. • Example: Cnidarians • (Jellyfish) • (Corals) • (Anemones)

  4. 3. Bilateral Symmetry • Animal configuration with left and right halves that mirror each other. • Example: Flatworms • (Flukes) • (Tapeworms)

  5. 4. Body Cavity • Fluid-filled opening • Example: Roundworms • (Hookworms) • (Pinworms)

  6. 5. Coelom • The fluid-filled body cavity that forms within the mesoderm. A better body cavity. • Example: Mollusks • (Clams) • (Octopus) • (Squid) • (Snails)

  7. 6. Segmentation • Body plan based on segments. • Example: Annelids • (Earthworms) • (Leeches)

  8. 7. Jointed Appendages • Jointed limbs • Limbs that have many parts • Example: Arthropods • (Insects) • (Crabs) • (Arachnids) • (Barnacles) • (Shrimp)

  9. 8. Deuterostomes • An animal whose mouth forms from an opening other than the blastopore • Example: Echinoderms • (Sea Stars) • (Sea Urchins) • (Sea Cucumbers) • (Sand Dollars)

  10. Evolution of Invertebrates Annelids Chordates Arthropods Echinoderms Mollusks Protostomes Deuterostomes Roundworms Bilateral Symmetry Flatworms Cnidarians Radial Symmetry Sponges Asymmetry Ancestral Animal

  11. 9. Notocord • A dorsal rod-like structure that runs the length of the body and serves as the internal skeleton. • Example: Chordates • (Fish, Sharks, Rays) • (Mammals, including Humans) • (Reptiles) • (Birds) • (Amphibians)

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