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RESPIRATORY SYSTEMS Common Features of Respiratory Systems. PROTISTS AND SIMPLE ANIMALS. E.g. amoeba, sponges, cnidarians, flatworms. EARTHWORMS (AND SOME AMPHIBIANS). Gill Systems. Tracheal Systems. Lung Systems. Human Respiratory System. Larynx & Trachea. ALVEOLUS AND GAS-EXCHAGE.
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PROTISTS AND SIMPLE ANIMALS • E.g. amoeba, sponges, cnidarians, flatworms
Human Respiratory System