The Phoronid Circulatory System

question 21

Multiple Choice

The phoronid circulatory system:

• A)is a closed system but lacks a heart.
• B)has hemoglobin dissolved in the plasma.
• C)is an open system with pulsatile organs circulating the hemolymph.
• D)is an open system with no heart and is dependent upon the hemoglobin enclosed in nucleated cells.
• E)is missing and all food and wastes readily diffuse through the lophophore.

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