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(B) Earthworms possess a closed circulatory system,where blood circulates within defined,walled blood vessels.Renal portal systems are characteristic

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Earthworm - Closed circulatory system

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(B) Earthworms possess a closed circulatory system,where blood circulates within defined,walled blood vessels.Renal portal systems are characteristic of amphibians and reptiles,not humans. Humans possess a hepatic portal system that transports venous blood from the digestive system to the liver.In cockroaches,the primary excretory organs are Malpighian tubules,whereas nephridia are the excretory structures found in annelids like earthworms.

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