Which of the following has closed circulatory system?
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a
Amphioxus
b
Balanoglossus
c
Limulus
d
Echinus
answer is A.
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Detailed Solution
Circulatory system of chordates (e.g., Amphioxus) is closed type (except urochordates). Balanoglossus (Hemichordata), Limulus (Arthropoda) and Echinus (Echinodermata) have open circulatory system.