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What Is an Animal? Biology Post Falls HS. Characteristics Heterotroph Movement (and sessile) Energy from nutrients Eukaryotic with adaptations.

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Presentation on theme: "What Is an Animal? Biology Post Falls HS. Characteristics Heterotroph Movement (and sessile) Energy from nutrients Eukaryotic with adaptations."— Presentation transcript:

1 What Is an Animal? Biology Post Falls HS

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3 Characteristics Heterotroph Movement (and sessile) Energy from nutrients Eukaryotic with adaptations

4 Development of Animals Fertilization of haploid gametes to form zygote Blastula forms (hollow sphere) Gastrula forms (indents to give 2 layers) Ectoderm and endoderm Ectoderm forms skin and nerves Endoderm forms digestive lining Mesoderm forms later into muscles, reproductive and circulatory

5 Development (cont) Gastrula opening becomes mouth in protostomes Gastrula opening becomes anus in deuterostomes Some develop larval forms before adult Birth occurs after development reaches a satisfactory stage Viviparous, oviparous, ovoviviparous

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7 Symmetry Balance in proportions of an organism General body plan or layout Asymmetry, radial symmetry, bilateral symmetry

8 Asymmetry Sponge Irregular No consistent design

9 Radial Symmetry Hydra, sand dollar Central area with parts radiating outwardly like spokes of a wheel Can be divided along any plane along its axis into relatively equal halves

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11 Bilateral Symmetry Humans Can be divided down its length into mirror image halves Anterior, posterior, dorsal, ventral More muscular control so more efficient food gatherers

12 Bilateral Symmetry

13 Body Plans of Bilats Coelom – true body cavity that develops from the fluid-filled cavity inside the mesoderm Acoelomate, pseudocoelomate, coelomate Examples

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15 Protection and Support Exoskeleton Endoskeleton

16 Protection and Support Vertebrate Invertebrate

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