The open circulatory system is present in-

(a) Arthropoda, (b) Annelida, (c) Chordates, (d) Mollusca

c only

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c and b

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a and b

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a and d

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Solution

The correct option is D a and d
An open circulatory system is present in members of phylum Arthropoda and Mollusca in which blood is pumped by the heart passes through large vessels into open spaces or body cavities called sinuses.
Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels.
So, the correct answer is option D.

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The open circulatory system is present in-(a) Arthropoda, (b) Annelida, (c) Chordates, (d) Mollusca

The open circulatory system is present in-

(a) Arthropoda, (b) Annelida, (c) Chordates, (d) Mollusca