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    Which one of the following statements is incorrect?

    Options :-

    1. Ctenophora are diploblastic marine animals with no digestive tract.
    2. Presence of gonoducts and copulatory organs in Platyhelminthes.
    3. Nephiridia is present in annelids for excretion and osmoregulation.
    4. Mollusca have open circulatory system.
    5. Respiration occurs by tracheae in Arthropods.
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