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Unformatted text preview: 1 Animal: Introduction Animal: Introduction Animals are multicellular, aerobic heterotrophs that reproduce sexually and some asexually Outline Outline c Key concepts c Several characteristics of animals c Some terms c Classification of Animal kingdom c Major animal groups c Key Terms c Conclusions Key Concepts: Key Concepts: c All animals are multicelled heterotrophs c Animals reproduce sexually or asexually c Animals originated about 1.2 million years ago c Comparisons of body plans of existing animals with fossils reveal that there were several trends in the evolutions of certain lineages 2 Key Concepts: Key Concepts: c The sponges are structurally simple animals without body symmetry c Cnidarians have radial symmetry c Bilateral symmetry is seen in animals more complex than the cnidarians and have developed organ systems Several characteristics of animals Several characteristics of animals c Animals – Multicellular Eukaryotes – Their cells lack cell walls – Heterotrophs - That ingest their food...
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- Spring '10
- Radial symmetry, Ctenophora Cnidaria Phoronida Chordata Mollusca Annelida Arthropoda Ectoprocta Rotifera Brachiopoda Platyhelminthes Echinodermata Ne mertea Porifera Ne matoda, symmetry Bilateral symmetry, body symmetry Cnidarians