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What four characteristics are common to members of the animal kingdom? What is the difference between an invertebrate and a vertebrate? Describe three different criteria used to classify animals into groups. What types of evidence are used to put together the evolutionary history of the animal kingdom? What characteristic makes sponges the simplest animals? Describe the two general body forms of cnidarians, which include jellyfish and corals. What are the three types of flatworms? Describe the main features of each.

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chealafi
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1.Collagen, diploid, hox genes, heterotrophs
2. Vertebrates have internal backbones
3.Body symmetry, number of tissue layers, developmental patterns
4.DNA, Hox genes, and comparisons of anatomy
5. Sponges are aquatic, invertebrate animals that make up the phylum Porifera. Sponges are the simplest multicellular animals found in the fossil record.
6. A Cnidarian can have one of two basic body types, polypoid or medusoid. The polypoid is the configuration of corals and anemones, with the tentacles and mouth generally facing up, and the other side affixed to a substrate or connected to a colony of other creatures of the same species.
7. flukes, Turbellarians, and tapeworms. Turbellarians free-living flatworms. Flukes are parasitic flatworms. Turbellarians are long flat parasitic worms

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