8. What is the difference
between octopuses and
mussels regarding their
circulatory systems? How
does that difference influence
the mobility of these animals?

Gap-fill exercise

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Cephalopod molluscs, like
and squids, have closed circulatory
system blood pumped under
flowing within vessels.
molluscs, like mussels oysters, have
an circulatory system (also
as lacunar circulatory ) where
blood flows low pressure since
falls in cavities the body and not
only circulate blood vessels.
Molluscs closed circulatory systems
larger, agile and actively move;
molluscs open circulatory systems
smaller, slow and are
practically sessile.