Fill in the Blank QuestionFill in the blank question.Humans have a circulatory system, as blood is always moving through blood vessels and the heart.
Question
Fill in the Blank QuestionFill in the blank question.Humans have a circulatory system, as blood is always moving through blood vessels and the heart.
Solution
The correct answer is "closed". Humans have a closed circulatory system, as blood is always moving through blood vessels and the heart.
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