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ABBOTTSCOLLEGE

Page 75. ABBOTTSCOLLEGE. Multicellular Heterotrophic Cells do not have cell walls Mainly reproduce sexually. Page 75. We must look at the relationship between their body Plans and modes of living We will start with the least advanced forms of aquatic life

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ABBOTTSCOLLEGE

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  1. Page 75 ABBOTTSCOLLEGE

  2. Multicellular • Heterotrophic • Cells do not have cell walls • Mainly reproduce sexually Page 75

  3. We must look at the relationship between their body Plans and modes of living We will start with the least advanced forms of aquatic life And note the evolutionary progress up the phylogenic tree

  4. Asymmetrical (have no symmetry) • Acoelomate (have no body cavity) • Have no tissue layers Bodies are a mass of cells embedded in a jelly-like Substance They function at the cellular level of organisation (meaning they have no tissues or organs)

  5. Body is supported and protected by a skeleton of minute spicules (made of calcium, silica or a protein), bringing food to the cells

  6. Collar cells (flagellated) line the interior cavity of the sponge and help to draw water through the cavity

  7. Digestion takes place intracellularly (inside the cells) • Excretion and respiration occur by diffusion

  8. Excretion and respiration occur by diffusion

  9. THE END

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