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The Animal Kingdom The Invertebrates (reference pages: 406-412) 1. Define symmetry: 2. Examine the organisms in figure 2 on page 407. Indicate which show Radial symmetry and which show Bilateral symmetry: Spider _____ Sand Dollar ____ Millipede ____ Flatworm ____ Octopus ____ Sea anemone ____ 3. In the boxes below draw ( different from above) an organism that : displays no symmetry displays radial symmetry displays bilateral symmetry 4. Complete “Reflect on your Learning” Pg 406 1,2, and 3a,b in your notebook. 5. What characteristics make an organism part of the animal kingdom? 6. Differentiate between an invertebrate and a vertebrate. Animals are generally classified using the following features: Body organization: Does the animal have tissues? organs? systems? 7. Define each of those terms. Number of body layers: the number of germ layers that an animal has is used to separate them into different phyla. 8a. Define germ layer, endoderm, ectoderm and mesoderm. 8b. What will each of these three layers become in the developed animal? Body cavities: the presence or absence of a coelom is also used to classify animals. 9a. Define coelom, acoelomate, pseudocoelomate, coelomate 9b. Label each of the cross sections to the left with one of the last three terms from 9a. 9c. For each of the diagrams label: endoderm, ectoderm, mesoderm, body cavity and gut. 9d. What is the advantage in having a coelom? Body symmetry: none? radial? Bilateral? 10a. Relate symmetry to the ability to move fast. 10b. Define cephalization 10c. What kind of symmetry do humans possess? Digestive Tract or Gut: Does the digestive tract have one opening or two? …a mouth and an anus? 11. Distinguish between and give examples of animals that are sessile and those that are motile.