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CHAPTER 3 CHAPTER 3 EXCRETION INTRODUCTION Many chemical reactions in the body produce waste products. The body needs to remove these waste products to stay healthy. Like…

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Slide 1 INVERTEBRATES Mollusca, Annelida, Arthropoda, Echinodermata Animals that lack vertebrae (classed by a characteristic they don’t have.) 97% of all species on Earth…

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