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What is the correct answer?

4

Which of the following is a matching set of the class and some of its main distinguishing features?

A. Sporozoa - infection by sporozoites transmission by intermediate host and a contractile vacuole

B. Trematoda - well developed suckers, flat and unsegmented body

C. Arachnida - 3 pairs of legs, chitinous exosketeton and poisonous sting

D. Insecta - compound eyes, segmented body and nephridia

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