Animals of which phylum contains open circulatory system?

Arthropoda

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Annelida

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Hemichordata

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Both (a) and (c)

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Solution

The correct option is C Both (a) and (c)
Both Hemichordata and Arthropoda has an open circulatory system. In this system the heart pumps blood into an open cavity called a hemocoel.

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Palaemon (prawn) has an open circulatory system and jointed legs. To which phylum does it belong?

Phylum	Level of organization	Symmetry	Coelom	Segmentation	Circulatory system	Digestive system	Respiratory system
???	Organ system	Bilateral	Coelomate	Present	Present	Complete	Absent

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