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Which one of the following is a characteristic of open circulatory systems but NOT closed circulatory systems?
Blood Concentration
Blood concentration refers to the amount of a particular substance present in a given volume of blood, often measured to assess health or the effects of substances or medications.
Draining
The act or process of depleting or being depleted of resources or energy.
Inert Substance
A substance that does not undergo chemical reactions under a set of given conditions, often used as a control in experiments.
Placebo
A harmless substance or treatment that has no therapeutic effect, used as a control in testing new drugs.
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