Which of the following are the first to have closed circulatory system?
(a) Molluscs
(b) Annelids
(c) Arthropods
(d) Echinoderms
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Answer...
Molluscs are the first and the only non chordates to have closed circulatory system. These include devil fish, cuttlefish, pila , etc.
option a.
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Answer:
b. annelids
Explanation:
as pheritema belongs to annelids it has closed circulatory system and has cappileries commonly
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