Which one of the following is a character of all Annelids, without any exception?

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Exhibit dioecious condition

Presence of parapodia

Presence of nephridia

Presence of open circulatory system

answer is B.

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Detailed Solution

All Annelids possess nephridia to help in osmoregulation and excretion. Among Annelids, parapodia are present only in Polychaetes (e.g., Nereis). Among Annelids, dioecious condition is present only in Polychaetes (e.g., Nereis). In all Annelids the circulatory system is closed type.

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