Question

Which of the following are the first to have closed circulatory system?
(a) Molluscs
(b) Annelids
(c) Arthropods
(d) Echinoderms

Answer 1

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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 2

Answer:

b. annelids

Explanation:

as pheritema belongs to annelids it has closed circulatory system and has cappileries commonly