The phylum Mollusca includes ___.

Slugs and snails are classified as ___.

Squids and octopuses are classified as ___.

Clams and other two-shelled shellfish are classified as ___.

An octopus has a ___ circulatory system where the heart circulates blood through blood vessels that form a loop.

Earthworms are classified as ___.

Earthworms have ___ on the outside of their body to help them move.

Annelid worms have ___.

In ___ circulatory systems, blood is pumped through vessels that empty into sinuses.

The shell of a snail is secreted by the ___.

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