Circulatory Systems in Molluscs

question 81

Multiple Choice

Circulatory systems in molluscs

• A) are open in all species of molluscs.
• B) are closed in all species of molluscs.
• C) are open in species of large-sized molluscs and are closed in species of small-sized molluscs.
• D) are open in species of small-sized molluscs and are closed in species of large-sized molluscs.
• E) are open or closed without regard to body size.

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