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Ch. 1 Classifying organisms:

Learn about the diverse world of invertebrates, including mollusks, worms, cnidarians, and arthropods. Explore their characteristics, similarities, and different ways of obtaining oxygen. Discover fascinating facts about the horseshoe crab and correct common misconceptions about insects and spiders.

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Ch. 1 Classifying organisms:

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  1. Ch. 1 Classifying organisms: How do we classify Invertebrates? Lesson 3

  2. Animals without Backbones • Most animals on Earth are INVERTEBRATES • Some are microscopic • Others quite large (giant squid) • Mollusks, worms, cnidarians and anthropods • Cnidarians (stinging cells to catch pray)

  3. Mollusks • Soft body without bones • Snails, slugs, clams, squids • Some have hard outer shells • May have gills • May absorb oxygen through their skin

  4. worms • Many different types • Flatworms = thin, live in wet or damp places • Roundworms = live in water or on land • Segmented Worms include earthworms • Some are microscopic & some are huge • 7 meters long (largest)

  5. CHECKPOINT • List 3 different invertebrates. How are they alike? • How are worms and clams alike? Different? • What is the largest invertebrate? • How do mollusks get oxygen?

  6. Arthropods – “Jointed Feet” • Insects, lobsters, & spiders • This is the largest phylum of animals • Bodies are divided into separate parts • Invertebrates • Get Oxygen different ways: • Gills • Grasshoppers/ tubes carry oxygen • Spiders use organs/ book lungs

  7. “weird science . . . What’s Older than a Dinosaur…?” The Horseshoe Crab has been around for about 450 Billion years and its blood is the color ______? Scientists harvest the blood of the horseshoe crab because it contains a molecule crucial for medical research. (Immune Cells) They do not use hemoglobin in their blood to transport oxygen instead they use hemocyanin, which contains copper, causing their blood to be blue.

  8. Misconceptions: Insects do not shed their skin Insects can’t “Breathe”- no lungs Spiders are not Insects A spider’s body has 2 segments Spiders are in the class Arachnida, even though it’s a invertebrate

  9. Butterflies, moths, & houseflies: Life cycles with big changes

  10. Dichotomous Key: use the key on pg. 21 to identify these animals

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