Question

the circulatory system has evolved form open to close type in animal kingdom which phylum can be called first to represents closed circulation

Answer 1

Answer:

According to the phylum order in the animal kingdom, the phylum Annelida is the first to have a closed circulatory system.

Explanation:

• Till the phylum Nematoda, they have an “open circulatory system where the exchange takes place through gaseous diffusion and the blood is filled in the hemocoel.
• From Annelida and then the Arthropoda, Echinodermata, Chordata, all have closed circulatory system.
• A “closed circulatory system” is marked with the presence of a system of closed blood vessels like arteries, veins, capillaries that carry blood to different parts of the organism.
• These vessels like in an earthworm are called dorsal and ventral vessels and supplies blood to the dorsal and ventral parts of the body respectively.

Answer 2

Circulatory System of Annelida

Explanation:

• As indicated by the phylum request in the animal kingdom,the phylum Annelida is the first to have a closed circulatory system
• The phylum Nematoda, they have an "open circulatory system where the trade occurs through vaporous dissemination and the blood is filled in the hemocoel  
• The vascular system comprises of arteries, veins and vessels. Vertebrates (animals with spines like fish, feathered animals, reptiles), including most warm blooded animals, have closed cardiovascular systems
• The two circulation pathways in spineless animals are the single and double circulation pathways