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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
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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

User Heracek
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answer is (OPEN)

Step-by-step explanation:

User Dmon
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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.
User Glaucus
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