Which of the following is not one of the advantages that a closed circulatory system has over an open circulatory system? a. the contents of blood come into closer contact with tissues in a closed system than an open system b. transport within a closed system is more rapid than an open system c. blood can easily be directed to specific areas in a closed system, but not in an open system d. in a closed system, molecules and cells that transport hormones and nutrients can be kept in vessels until they unload their goods at specific tissues.

The correct answer is option A. "The contents of blood come into closer contact with tissues in a closed system than an open system".

Explanation:

In a closed circulatory system, the blood has an specific path, circulating from arteries to veins and to smaller blood vessels throughout the body. This is in contrast with open circulatory systems at which the blood is not contained in arteries or veins but it suffuses the body. A closed circulatory system have many advantages over open circulatory system, however in a closed circulatory system the contents of blood are not into closer contact with tissues in than an open system. Actually, in an open circulatory system the blood is in closer contact with tissues.

b is the correct answer