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Q.

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.

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