Natural World G4 U3-L1

An internal support structure in an animal is a(n)  _____________.

A soft-bodied invertebrate, such as a clam or snail, is called a(n)  _____________.

An invertebrate with poisonous stingers is a(n)  _____________.

A spiny-skinned invertebrate, such as a sea star, is called a(n)  ____________.

The hard outer covering that protects an invertebrate’s body is its  ____________.

An invertebrate with jointed legs and a sectioned body is a(n)  _____________.

A(n)  ____________ is an animal without a backbone.

The simplest kind of invertebrate is a(n)  _____________.

Clams and oysters are types of

• arthropods.

• mollusks.

• shells.

• cnidarians.

Which of these arthropods has the most body sections?

• a centipede

• an insect

• an arachnid

• a crustacean