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B
Pila - Pelecypoda
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C
Spider - Arachnida
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D
Unio - Gastropoda
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Solution
The correct option is A Spider - Arachnida Arichnida is a class, under the phylum Arthropoda. The class is characterized by organisms have 8 (4 pairs) jointed legs. Body is divided into cephalothorax and abdomen.
Examples of the class are - spiders, ticks, scorpions, mites etc