Question -
Which invertebrate phylum possesses the following features? Bilateral symmetry, triploblastic, metamerism, open vascular system
Options:
A .  Annelida
B .  Mollusca
C .  Arthropoda
D .  Both Annelida and Arthropoda
Answer: Option C : C Bilateral symmetry, triploblastic nature and metamerism are seen in both Annelida and Arthropoda. However, arthropods possess an open vascular system, while annelids possess a closed type.
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