Question

Circulatory system is first completed in which Phylum. A)Annelida B)Arthopoda. C)Platyhelmithes D)Aschelminthes​

Answer 1

Arthiphoda.......the second option.........

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Answer 2

Answer:

Annelida is the first phylum that completes in closed circulatory system. Arthropods in open circulatory system.  

Explanation:

• The closed circulatory system is more advantageous than open circulatory system.
• That is, the combining of oxygenated and deoxygenated blood does not occur.
• As well the blood flow efficiency is increased as the blood pressure increases.
• The blood flow differs in others where the evolution of circulatory systems.
• Arthropods shows no distinction between interstitial fluid and blood which is known as haemolymph.