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Sponges

Sponges. Chapter 9 Section3. Live all over the world (oceans, freshwater rivers and lakes). Sponges. Invertebrate animals No body symmetry Never have tissues or organs Looks like a hollow bag L arge opening at one end and tiny pores covering the surface

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Sponges

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  1. Sponges Chapter 9 Section3

  2. Live all over the world (oceans, freshwater rivers and lakes) Sponges

  3. Invertebrate animals • No body symmetry • Never have tissues or organs • Looks like a hollow bag • Large opening at one end and tiny pores covering the surface • Spikes support and protect sponges body Sponge: Body Structure

  4. Eats tiny single-celled organisms • Collar cells that line central cavity, trap the tiny organisms • Jelly-like cells inside sponge digest, or break down, the food • Sponges get oxygen from water Sponge: Obtaining Food and Oxygen

  5. Asexually • Budding: small new structures grow from the sides on an adult sponge • Buds eventually break free and begin new life • Sexually • Sponges produce both sperm cells and egg cells (do not have separate sexes) • Sperm cells released in water, enter another sponge, fertilize its eggs, larva develops • Larva: immature form of an animal that looks very different from the adult Sponges: Reproduction

  6. Cnidarians Chapter 9 Section3

  7. Jellyfish, corals, and sea anemones • Invertebrates that have stinging cells to capture food and protect themselves • Take food into central body cavity Cnidarians

  8. Two different body plans (vase and bowl) • Radial symmetry • Central hollow cavity • Tentacles containing stinging cells Cnidarians: Body Structure

  9. Vase-shaped body plan is a POLYP • Sea anemone • Mouth opens at top • Tentacles spread out from aroundmouth • Most are attached to underwater surface Body Structure:Polyp

  10. Bowl-shaped body plan is a MEDUSA • Jellyfish • Adapted for a swimming life • Mouths open downward and tentacles trail down Body Structure:Medusa

  11. Use stinging cells to catch animals they eat (prey) • Contains threadlike structure with spines • Uses tentacles to pull prey to mouth • Takes food into central body cavity • Expels undigested food through mouth Obtaining Food

  12. Unlike adult sponges, many cnidarians move to escape danger and to obtain food • Jellyfish? • Sea Anemones? Movement

  13. Asexual Reproduction • Hydras, corals, and sea anemones • Sexual Reproduction • Jellyfish Reproduction

  14. Colony • a group of many individual animals • Stony corals and Portugese man-of-war Life in a Colony

  15. a coral reef is built by cnidarians • coral reefs are home to more species of fishes and invertebrates than any other environment on Earth • Coral polyps produce hard, stony skeletons around their soft bodies Stony Coral

  16. Contains as many as 1,000 individuals that function together as one unit • Top: gas filled chamber, allows colony to float • Bottom: polyps with different functions drift below • Some catch prey and help with digestion and reproduction Portugese Man-of-War

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