Chapter 2 Quest

squids and octopuses

• gastropods

• bivalves

• cephalopods

slugs and snails

• gastropods

• bivalves

• cephalopods

clams and other 2-shelled shellfish

• gastropods

• bivalves

• cephalopods

identical or almost identical repeating body parts

• open circulatory system

• closed circulatory system

• segment

a heart circulates blood through a network of blood vessels that form a closed loop

• open circulatory system

• closed circulatory system

• segment

simple heart pumps blood through blood vessels that empty into spaces in the animal's body called sinuses

• open circulatory system

• closed circulatory system

• segment

Mollusks have a ______________-complex nervous system than that of flatworms and roundworms.

• simple

• more

? are the second largest phylum of animals.

• Vertebrates

• Insects

• Mollusks

• invertebrates

A mollusk has a ? body, usually covered by a ?.

• soft, shell

• hard, shell

• soft, mantle

• hard, mantle

a mollusk uses its ? to move.

• legs

• arms

• foot

• wings