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Most arthropods and some mollusks and tunicates have _____ circulatory systems, which means fluid transporting nutrients and oxygen flow directly into internal organs. a. closed b. nonexistent c. open



Answer :

Arthropoda and molluscs have open circulatory systems - meaning haemolymph (Their equivalent to blood) directly bathes the tissue, and isn't enclosed in blood vessels, as seen in a closed blood system, as in humans for example.
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answer is (OPEN)

Explanation:

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