Cockroaches can survive without head as they have closed circulatory system.
though cephalochorates do not possess heart , how can they have closed circulatory system?
Is open circulatory system present in cockroaches?
Annelida have closed circulatory system, while Anthropoda and Mollusca have open blood circulatory system. Although, closed circulatory system is considered more advanced than open blood circulatory system, then why is Anthropoda and Mollusca grouped after Annelida?
Do Flatworms have a closed circulatory system?