Which of the following statements is correct about the circulatory system in animals?

1) Blood circulation occurs in closed vessels in arthropods

2) In annelids, the tissues are not in direct contact with the circulating fluid

3) In fishes, the heart pumps deoxygenated blood only

4) The circulatory system transports excretory substances to the excretory organs

Answer:1) Blood circulation occurs in closed vessels in arthropods

Explanation: Arthropods have an open type of circulatory system. Blood circulation does not happen in closed vessels. Haemolymph fills the coelom called haemocoel and body tissues and organs come in direct contact with the circulating fluid.

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