Annelida|Arthropoda|Mollusca

Arthropoda || Mollusca

Which of the following is common in Annelida and Arthropoda?

………. acts as a connecting link between Annelida and Arthropoda.

Which among the following have open circulatory system? (i) Arthropoda (ii) Mollusca (iii) Annelida (iv) Coelenterata