Circulatory Systems in Molluscs

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.