Chap32 Animal - Animal: Introduction Animals are...

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Animal: Introduction Animal: Introduction Animals are multicellular, aerobic heterotrophs that reproduce sexually and some asexually
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Outline Outline Key concepts Several characteristics of animals Some terms Classification of Animal kingdom Major animal groups Key Terms Conclusions
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Key Concepts: Key Concepts: All animals are multicelled heterotrophs Animals reproduce sexually or asexually Animals originated about 1.2 million years ago Comparisons of body plans of existing animals with fossils reveal that there were several trends in the evolutions of certain lineages
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Key Concepts: Key Concepts: The sponges are structurally simple animals without body symmetry Cnidarians have radial symmetry Bilateral symmetry is seen in animals more complex than the cnidarians and have developed organ systems
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Several characteristics of animals Several characteristics of animals Animals Multicellular Eukaryotes Their cells lack cell walls
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Chap32 Animal - Animal: Introduction Animals are...

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