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Introduction to the Animal Kingdom Chapter 18. What Is an Animal? Eukaryotic Eukaryotic Multicellular Multicellular Heterotrophs Heterotrophs No cell.

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Presentation on theme: "Introduction to the Animal Kingdom Chapter 18. What Is an Animal? Eukaryotic Eukaryotic Multicellular Multicellular Heterotrophs Heterotrophs No cell."— Presentation transcript:

1 Introduction to the Animal Kingdom Chapter 18

2 What Is an Animal? Eukaryotic Eukaryotic Multicellular Multicellular Heterotrophs Heterotrophs No cell walls No cell walls

3 INVERTEBRATES 95% of all animal species 95% of all animal species No backbone or vertebral column No backbone or vertebral column Includes microscopic dust mites to the giant squid Includes microscopic dust mites to the giant squid

4 VERTEBRATES Backbone Backbone Only 5% of all animals Only 5% of all animals Fishes Fishes Amphibians Amphibians Reptiles Reptiles Birds Birds Mammals Mammals

5 What Animals Do to Survive Feeding, Respiration, Circulation, Excretion, Response, Movement & Reproduction

6 Feeding

7 Feeding Styles Herbivores eat plants Herbivores eat plants Carnivores eat other animals Carnivores eat other animals Omnivores eat plants & animals Omnivores eat plants & animals Detritivores eat decaying plants & animals Detritivores eat decaying plants & animals Filter Feeders strain floating plankton Filter Feeders strain floating plankton

8 Respiration Oxygen IN Oxygen IN Carbon Dioxide OUT Carbon Dioxide OUT

9 Circulation Transport materials around body Transport materials around body Oxygen Oxygen Nutrients Nutrients Wastes Wastes

10 Excretion Removes all metabolic waste Removes all metabolic waste

11 Response React to environment React to environment Use specialized cells - nerves Use specialized cells - nerves

12 Movement Most animals are motile by muscle contractions Most animals are motile by muscle contractions

13 Reproduction Sexual and Asexual Sexual and Asexual Increase in numbers Increase in numbers Sexual helps maintain genetic diversity in populations Sexual helps maintain genetic diversity in populations

14 Body Symmetry Bilateral: An imaginary plane can divide the body into two equal halves. Bilateral: An imaginary plane can divide the body into two equal halves. Example: crayfish Example: crayfish Radial: any number of imaginary planes can be drawn through the center, dividing it into equal halves Radial: any number of imaginary planes can be drawn through the center, dividing it into equal halves Example: sea anemone Example: sea anemone

15 Bilateral symmetry

16 Radial Symmetry

17 Trend in Animal Evolution Complex animals Complex animals Higher levels of cell specialization Higher levels of cell specialization Higher levels internal body organization Higher levels internal body organization Bilateral body symmetry Bilateral body symmetry Front end (head) with sense organs (cephalization) Front end (head) with sense organs (cephalization) Body cavity formation: fluid filled space that allows for organs to grow & expand. Body cavity formation: fluid filled space that allows for organs to grow & expand.


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