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प्रश्न
Which of the following is the characteristic of the phylum to which the housefly belong?
विकल्प
acoelomate
four-chambered heart
spinal cord
open circulatory system
MCQ
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उत्तर
Open circulatory system
Explanation:
The housefly belongs to Arthropoda, whose members characteristically have an open circulatory system. Arthropods are not acoelomates or chordates, and a four-chambered heart is not a defining feature of the phylum.
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