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Chapter 2: Mollusks, Arthropods, and Echinoderms

Chapter 2: Mollusks, Arthropods, and Echinoderms. I. Mollusks. A. Characteristics of Mollusks 1) Body Structure 2) Circulatory System 3) Obtaining Oxygen. II. Arthropods. A. Characteristics of Arthropods 1) Outer skeleton  exoskeleton: waxy, waterproof covering (outer skeleton)

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Chapter 2: Mollusks, Arthropods, and Echinoderms

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  1. Chapter 2: Mollusks, Arthropods, and Echinoderms

  2. I. Mollusks A. Characteristics of Mollusks 1) Body Structure 2) Circulatory System 3) Obtaining Oxygen

  3. II. Arthropods A. Characteristics of Arthropods 1) Outer skeleton  exoskeleton: waxy, waterproof covering (outer skeleton)  molting: “shedding their skin” 2) Segmented body  head, midsection, and hind section 3) Jointed appendages  antenna: sensory organs 4) Diversity over 1,000,000 species!

  4. B. Crustaceans 1) Body Structure  2-3 body sections; 5 or more pairs of legs; 2 pairs of antennae 2) Obtaining Food and Oxygen gills; scavengers – carnivores or herbivores 3) Life Cycle metamorphosis C. Arachnids • 2 body sections, 4 pairs of legs, 0 antennae 1) Spiders  eat by using their fangs like straws 2) Mites  most mites are parasitic 3) Scorpions venomous stinger attacks prey 4) Ticks  parasitic; can carry Lyme disease

  5. D. Centipedes and Millipedes

  6. III. Insects A. Body Structure 1) Head 2) Thorax 3) Abdomen B. Obtaining Food  different mouthparts C. Life Cycle 1) Complete metamorphosis 2) Gradual metamorphosis

  7. IV. Insect Ecology A. Insects and the Food Chain • Food Chain: 1) producers - make their own food 2) consumers - eat other organisms 3) decomposers - break down wastes and dead organisms • Insects play key roles in food chains because of the many different ways that they obtain food and then become food for other animals. • Insects can even be food for humans. B. Other Interactions • Pollen Carriers - EX: bees, beetles, flies • Disease Carriers - EX: mosquitoes and fleas C. Controlling Pests • To try to control pests, people use chemicals, traps, and living things, including other insects (biological control).

  8. V. Echinoderms A. Characteristics of Echinoderms 1) Body Structure: endoskeleton (invertebrate); radial symmetry 2) Movement: water vascular system (tube feet) 3) Reproduction & Life Cycle B. Diversity of Echinoderms 1) Sea Stars 2) Brittle Stars 3) Sea Urchins 4) Sea Cucumbers

  9. Chapter Review • Test Format • MC and T/F • Short Answer and Essay • Diagrams • Characteristics of Arthropods (pg. 49) • Sea Star (pg. 71) • Essay (choose one!) • 1) Describe the stages of complete metamorphosis. • 2) Name the three body sections of insects, and tell which organs and appendages are found on or in each section.

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